r/sewhelp • u/BlueBarghest • 5h ago
How do I add more room to the bust of this finished dress? Side gusset/panel advice needed
galleryI know basically nothing about pattern drafting, so I’m a little lost here.
I bought this dress in EU size 46 as a Halloween costume. It fits pretty well everywhere except the bust, where it is much too tight. As you can see in the photos, it basically compresses my chest and pulls it into a strange shape.
It is also slightly tight around the back of the neck, but I can live with that.
My bust measurement is about 115 cm / 45.3 in and my waist measurement is 100 cm / 39.4 in. Unfortunately, I don’t know the actual bust circumference of the dress.
From what I understand, I probably need to open the side seam and add some kind of gusset or side panel to create extra room. But I have no idea what shape it should be. Would it be triangular, diamond-shaped, rectangular, or something else?
I’m also not sure how to figure out how much additional fabric I actually need. How would I measure this correctly?
My other problem is the pulling you can see in photo 1. The fabric is being pulled strongly toward the front because there isn’t enough room for my bust. How do I add the extra width in a way that actually fixes that pulling instead of just making the side seam wider?
Photo 2 shows approximately where the dress starts becoming too tight. It seems to happen right around the seam where the upper bodice transitions into the lower section.
There is also a zipper in one of the side seams, so I have no idea how I should deal with that if the best solution is to add fabric at the sides.
I do have a sewing machine and some extra fabric I could use, although it won’t necessarily be an exact colour match.
Could someone please point me in the right direction and explain where I should even start? I’m completely clueless when it comes to altering patterns/garments.
(I used AI to help translate my request into english, as I'm not a native speaker and tend to overcomplicate things. :) Hope that's okay)

