craftgrrl | dress making, measurement question (Reply)

I don't think this is the exact community for this question but since it is "somewhat" related I thought there might be someone here with advice. (or can point me to another community)

I found two exquisite vintage dresses recently at a thift store. The problem is they are too small in the ribcage/breast area and I can't zip them up. I am in the process of losing weight but I don't know if the circumference around my ribcage will change much. However, I do believe my bust size will decrease.

I was trying to find a sewing or dress design community to ask if I should hold on to them to see if they would fit if I lost weight, or if I can modify the dresses (or possibly copy the design somehow and increase the size), or if I should just get rid of them. I just have really little to no experience with pattern making and how to calculate the measurements, etc.

Anyone know if there are any good sewing communities that would be helpful or have any ideas? I searched but nothing came up really.

Thanks!
<3