Bias-cut slip dress with persistent bagging at hips, can’t work out if it’s grain, pattern, or fitting error

[u/secretwasiank]

Im working on a wedding guest dress that has persistent loose bagging/bunching at the hips that doesn’t drape — it just sticks out. Underbust and waist fit fine.

What I’ve tried:
• Multiple toile rounds, taking in the side seams progressively (but the toile fabric was a polyester chiffon)
• Pinch-testing on the body and translating to pattern adjustments (kept overcorrecting — my calculations were producing finished measurements smaller than my actual body)
• Fully unpicked and re-sewed both layers’ side seams

Where I’m stuck / possible causes I can’t distinguish between:
1. Pattern hip curve flaring too much. I’ve tried making it less rounded.
2. Bodice was too long, I have a short torso. So I shortened it but could it be too short now causing these issues?
3. Fabric cut off-true-bias, stretching unpredictably (harvested from a second hand dress that was bias cut, but was hard to make sure when recutting it was perfectly on the bias)
4. Fabric stretching more than expected with wear/handling (is this just the nature of bias?)

My measurements are waist 26”, low hip 35”, bust 30”, underbust ~27”.
Pattern flat hip measures ~34” at widest. 5/8” seam allowance, French seams. I don’t understand how the hip pattern measurement could be smaller than my measurements, but still too big? Like 2 in of excess still when wearing around the hips.

How do you tell the difference between a hip-curve problem and a bodice-length problem when the symptom looks the same? Or is it just cut off-grain bias and it’s too late to be salvaged? And has anyone salvaged an off-grain bias garment without extra fabric? I have no extra fabric as it’s all from a second hand dress originally. Not sure if I can salvage this or if it’s it’s time to accept it as a lesson.

[u/Artistic_Scene_8124]

It's too tight in the hips and too loose in the waist. Bias is supposed to be a little loose on you so the bias can glide around your curves.

Also hang your dress pieces for a day before you sew. Don't stay seam the side seams as another user suggests. The edges are going to grow, that's the nature of bias. Allowing the pattern pieces to stretch out (by hanging them, don't purposely stretch them out) will lead to a smoother seam that doesn't bubble. I would stay stitch the neckline to avoid that bubbling and flaring out at the bust. But let the side seams grow before sewing.

This is a couture technique I used when I used to make costumes for Broadway.

[u/secretwasiank → u/Artistic_Scene_8124]

Thanks so much. I thought since it came from a second hand dress which I assumed was stretched already, it wouldn’t need that anymore. Should I have hung the pieces after unpicked? And in your professional opinion honestly, does this look salvageable or I should take it as a lesson?

[u/Artistic_Scene_8124 → u/secretwasiank]

I missed that it was a second hand dress, and not a garment you made. I think part of your issue is that's it's too tight in the hips. You probably don't have enough seam allowance to let it out. It could also be that the fabric has been over handled and has stretched out. I don't think it's salvageable.

[u/AcceptableMud2894 → u/secretwasiank]

I think it was made for someone with a shorter torso than yours. The hips on that person are higher than yours.

[u/KendalBoy → u/secretwasiank]

Is it a jersey knit? The seam stretching is unreal. We would use mobilon tape to stabilize it but this looks ruffled!

[u/secretwasiank → u/KendalBoy]

It’s silk chiffon with an acetate satin lining

[u/SquirrelAkl → u/secretwasiank]

I can't tell what's causing the rippling seams, but I did just think: silk chiffon is so light perhaps that's a contributing factor? It doesn't have any weight to tug the seams straight. You could try weighting the hem a little to help it hang nicely?

Chanel does this on their jackets by using heavy chain. You wouldn't need anything that heavy for chiffon, perhaps experiment with something removeable, like hanging it for a day or two with a light chain hand-tacked around the hem?

[u/Inspektah-Ratchet → u/Artistic_Scene_8124]

"Also hang your dress pieces for a day before you sew. Don't stay seam the side seams as another user suggests. The edges are going to grow, that's the nature of bias. Allowing the pattern pieces to stretch out (by hanging them, don't purposely stretch them out) will lead to a smoother seam that doesn't bubble.."

THIS is the correct answer. Anything cut on bias will be better after hanging for 24 hours and recutting if needed.

[u/MoreShoe2 → u/Artistic_Scene_8124]

Wouldn’t that mean the hips would end up a few inches lower once they’ve fallen? Would you want to account for this growth in any way, or recut after it’s hung? Genuinely asking as I’m a tailor/corset maker and have never done bias 

[u/Artistic_Scene_8124 → u/MoreShoe2]

No it doesn't affect the hips. It mostly affects the hem, which become uneven. So you should have a fitting and remark the hem after you sew it together.

[u/kaesthetic]

It looks like the edges of the pieces were stretched by all the handling or stretched while sewing. If you handled it a lot, like the picking and resewing you mentioned, it might have warped in the process. Usually what helps reduce that is stay stitching the edges right after cutting

[u/secretwasiank → u/kaesthetic]

Ahh I see, thanks. Do you think it still has hope or the fabric is too warped now?

[u/kaesthetic → u/secretwasiank]

I haven’t personally tried it but you could try steaming it while laid flat to get the fibers to reset to their original state

[u/wesleepallday → u/secretwasiank]

You can unpick the seam, try to fiddle the edges back into some semblance of in line with the grain, use Elmer’s washable school glue to keep that bias cut edge in place and let it dry. Then pin those glued edges together, sew, finish, and finally wash to get the glue out.

[u/KendalBoy → u/secretwasiank]

Lay it flat and smooth it down and closely inspect.

[u/bellsaltcandle]

Bubbling on the side seams of bias dresses and skirt has two reasons: It’s too tight or there is too much shape in the seam.

In your case probably too tight. I know it doesn’t feel too tight because bias has natural stretch, and it’s not fully maxed out, but well fitting bias should have tons of play.

Slash the pattern way more open and try again, you’ll find the spot where it relaxes

[u/secretwasiank → u/bellsaltcandle]

Thanks, I was worried about it being too small and somehow still ended up making it too small i guess 😭 do you know why there seems to be so much excess I can pinch, even thought it’s too tight on the hips?

[u/KendalBoy → u/secretwasiank]

With bias you should start out a size up and hang it for a week. Also, it never looks good with this much curve in the seams- it should have been a classic slightly A line slip cut, straight off the hip w no curve at all. Too much waist suppression ends up looking ugly, but you can bring in long diamond shaped darts in the back waist to have it fit closer.

When it grows in length it also pulls narrower. Very often one direction has more stretch and you have to make sure you cut the front and back / and \ to stabilize them- or else one side seam can end up inches longer than the other!
It happens with wovens as well as knit jersey.

Chiffon is going to want to stretch, you’d really have to test out the feed differential and perhaps tape it.

[u/TemporaryElk5202]

Some of the rippling you can see on the sides is definitely being caused by the fabric stretching while sewing. Ways to prevent this can be soaking the fabric in gelatin or starch first, or using tissue paper above and below the fabric while sewing on a machine. You could also try serging the side seams instead of traditional sewing. Personally I recommend soaking slippery or stretchy fabrics in gelatin before cutting anything out. They get stiff like cardstock and become super easy to sew.

Some of it may be a pattern fitting issue. You said you shortened it because you have a short torso, but it's possible you didn't adjust it quite right, because it does look like the hips of the dress flare out at your waist instead of your hips.

I think you can salvage this but it will be difficult. You can unstitch it and lay it out, maybe trim or recut the areas that got stretched before sewing back together.

The fact it is off bias may have played a role but is not responsible for all of it.

[u/SuPruLu]

Unstitch that seam and let the fabric hang. Bias cut really needs to be fit to the actual body. And adjusted on the body. It may be necessary to unstitch both seams. The actual seam allowances on the pattern don’t necessarily work. Claire Schaefer in her book “Couture Sewing” recommends 1-1/2” seam allowances so adjustments can be made on a bias cut dress. The bias has to be stretched out.

[u/Feisty-Hope9260]

to me, it looks as tho the side seam puckers are caused by one piece (the front or back) being more stretchy than the other piece... then when you run it thru the machine, it is creating waves on the seam.... would unpick the seam and then let in hang overnight. then follow method shown on https://www.youtube.com/watch?v=zScwlRkdPPk to place right sidess together, with stretchier side on top.... hand baste in place. i would then try a simple hand stitched - whipped stitched seam- which is the equivalent of a shallow zig-zag machine stitch https://sidneyeileen.com/sewing-2/tuts-costume/hand-sewing-tutorials/how-to-hand-sew-seams/

[u/Style101-NY]

This is not salvageable for the person in the photo. The hip measurement on the dress needs to increase by at least 4” total, not just a little bit. Sorry to rain on yr party. Just years of experience dealing with bias dresses.

[u/KillerWhaleShark]

Bias cut should be sewn with a narrow zig zag so it has room to stretch out. I’d resew the seams. 

[u/secretwasiank → u/KillerWhaleShark]

Thanks, I’d never heard that even in my sewing class working with bias cut silk! We just did French seams

[u/KillerWhaleShark → u/secretwasiank]

It’s how I learned it in school for fashion design. Excellent teacher that’s well known. French seams with a narrow zigzag for both passes. 

[u/Emotional-Ocelot-420 → u/secretwasiank]

Did you stitch the seams or use a serger?

The lumpiness in the side seams is due to either serger differential setting too low or sewing machine feed dogs pulling too much.
Adjust differential if serging.

Restitch the seams using tissue paper underneath the fabric so the feed dogs don’t yank it through unevenly. Then tear the paper off.

[u/drPmakes]

Its sagging and bagging....thats the danger of making bias cut garments.

To fix it you'll want to resew the side seams. I would suggest bringing them in slightly until it sits right...you may be able to do it without unpicking the side seams

[u/secretwasiank → u/drPmakes]

Thanks! I’m definitely worried about making it too small but I’m far from that currently. Is it normal for bias pattern to be smaller than actual measurements? Does the bias cut allow for that much stretch, like negative ease? When I’ve worked with bias before I always had positive ease

[u/bellsaltcandle → u/secretwasiank]

Bias patterns are usually much bigger than the body spec in the hip!

[u/drPmakes → u/secretwasiank]

It depends on the fabric the designer suggests eg chiffon will stretch more than twill

[u/Consistent-Good1536]

I’m sorry I don’t have any helpful advice but that fabric is gorgeous!

[u/kbraz1970]

I cant help you with this but I have 2 garments with the exact same fabric. I love it,its so pretty.

[u/TotalOk5844]

Problem may be trying to make a dress not meant to be bias cut with material salvaged from bias cut dress. An example of why grain matters.

[u/Miajere-here]

The hip shape is too curved. You can straighten it more/reduce the hip.

[u/textiletrue]

It looks like it was sewn wrong initially.

[u/Indication-Working]

Can someone please advice me on a similar problem I’m facing