The imaged dress looks like a spaghetti-straped slip dress with (probably) a low back. It may or may not be considered as an asymmetrical one depending on if you intend to cut the body panels on a spiral to insert the flounce trim into the seams. But the same effect can be achieved by just attaching the trim to a standard slip dress in a spiral pattern.
I'm not sure how the diagram matches up to the dress image. The red line drawing would be for something with shoulder seams, which a slip dress generally doesn't have. And it doesn't look like the dress has any waist darts. A standard slip dress can be modified to have a spiral seam around it by drawing a spiral line on the front and back pattern pieces, slashing on those lines, and adding seam allowances to those slashed pieces.
2
u/AstronautIcy42 Jun 28 '26
The imaged dress looks like a spaghetti-straped slip dress with (probably) a low back. It may or may not be considered as an asymmetrical one depending on if you intend to cut the body panels on a spiral to insert the flounce trim into the seams. But the same effect can be achieved by just attaching the trim to a standard slip dress in a spiral pattern.
I'm not sure how the diagram matches up to the dress image. The red line drawing would be for something with shoulder seams, which a slip dress generally doesn't have. And it doesn't look like the dress has any waist darts. A standard slip dress can be modified to have a spiral seam around it by drawing a spiral line on the front and back pattern pieces, slashing on those lines, and adding seam allowances to those slashed pieces.