I posted a really long post and didn't get many responses, so reposting a short version:
Stylist recommended a size 4, I ordered a size 6 knowing I wanted to gain 5-6lbs since my face was too thin (which I told the stylist). Gained 6.5lbs and now the size 6 is too snug.
Seamstress said she could let it out a bit and I shouldn't lose weight. But, it's silk so I'm afraid thread holes will be visible. And don't think letting it out a bit will do much as I can barely sit.
Don't really want to lose more than 2-3lbs at most and although I'll have it let out, I still think I'll look like an overstuffed sausage. Ugh.