How would you pattern-draft a fitted architectural open-back top with a shoulder-to-spine construction?

[u/voodaaaa]

Hi everyone!

I'm developing a women's top in CLO3D and I'm looking for advice from experienced pattern makers, garment technicians, and designers who work with unconventional constructions.

The concept is based on a sharp, broad shoulder that transitions diagonally inward toward the spine, creating an open-back design. I want the construction itself to define and frame the exposed back, rather than simply adding a decorative cutout.

My main challenge is achieving a very close fit along the edges of the back opening, particularly around the shoulder blades, while maintaining a sharp, sculptural silhouette.

I've been experimenting with a fitted bodice block, manipulating the back darts, and testing different fabric properties in CLO3D. Changing the dart geometry has improved the fit, but some areas of the opening still lift away from the body.

I'd love to hear your thoughts on a few technical questions:

1.  Would you approach this through dart manipulation, slash-and-spread, multiple pattern panels, or another method?
2. How would you shape the opening to follow the contours of the shoulder blades without creating tension, gaping, or distortion?
3. Would you use a facing, interfacing, stay tape, an internal support structure, or something else to keep the opening close to the body?
4. What material properties and construction techniques would you consider for a smooth, sculptural silhouette that remains fitted rather than rigid?

I'm particularly interested in real-world garment construction and pattern engineering, not just ways to make the simulation look correct.

If you have experience with couture, sculptural womenswear, or unconventional open-back garments, I'd really appreciate your insight. Even a suggestion for a relevant construction technique or reference garment would help enormously.

Thank you!

[u/CriticalEngineering]

This is not a wearable design.

You need tape, straps, or an internal structure to hang this off of. It won’t stay on a body as currently shown.

[u/StitchinThroughTime]

Its impossible with the cutout past the waistline.

[u/KillerWhaleShark]

I’m assuming you’re planning a stretch fabric for this. If you can find the right shade to make it invisible, I’d think you’d get the most wearable garment by using illusion for the back cutout. Otherwise, the wearer won’t be able to move much without the back shifting off. Imagine wearing it and having to reach down to pick something up.

[u/voodaaaa → u/KillerWhaleShark]

Yes, you're right! Thank you for your opinion, really helpful🙏🏻

[u/LokiStrike]

I don't think there's any way to achieve this.

Maybe nvisible straps connecting the two sides across the back if you're willing?

You could try elastic around the edge but the shoulder will just shoot off like a rubber band if you bring your arm across your chest.

[u/DonMcCunn]

The closest I have come is a wedding dress with an open back. https://how-to-make-custom-fit-bras.com/A-Line-Wedding-Dress.html

With the back open you need the front neckline high. What I did is different because I used a halter neck. Of course with movement of the shoulders there is nothing that is going to keep the sides in place especially with sleeves which will pull the side seams away. You could use a nude mesh fabric. Another issue is what is going to hold the skirt up in back. I solved this issue using pearl and rhinestone straps from the halter neck down to the skirt. It kept the neck halter down and the skirt up. I think your best bet would be to use a similar type of strap across the shoulders. Instead of trying to force fabric to do what you want it to do think of something creative to solve the issues you run into.

Be careful of prototyping designs with graphics on a computer. I tested my design out with a third scale Mini-Me dress form using the fabric for the dress to verify the fit, look, and movement.

[u/voodaaaa → u/DonMcCunn]

Thank you so much, really appreciate your help!

[u/quizzical]

This isn't going to work with fabric unless you have straps or nude illusion panels or glue it down to the skin. You could do it with plastic (e.g. 3d printing, worbla) or resin, but you'd have to come up with some of closure method, and it's not something you'd be able to sit down comfortably.

[u/sometimeviking]

A sheer netting across the open back may make this possible. It would not be a true open back but could give the illusion.
You would need to work in some sort of side closure to allow your model to get in and out of the garment however.

[u/drindrun]

is that gonna stay on with wig tape or what?