Help Prom Problem

I know this group is for makeup but I'm sure someone has some tips for this. I bought my prom dress last year didn't get to wear it because prom was cancelled this year the dress still fits and zips up but won't stay shut(also can't use the hook thing because will just rip off) I've lost 20 pounds and it still does the same thing I assume my boobs just grew. Does anybody have any hacks, type of clip or pin I can use to keep the zipper up? No idea is a bad idea desperate times!