Quote from Bk11223
I just re-read your post and well if you are worried about looking "frumpy" in your uniform, fear not, not one person will care if you do. They will care if you are cleanly and modestly dressed, and performing your skills appropriately. Clinicals aren't a fashion show.
I disagree. In nursing school especially, nursing students are expected to look as professional as possible. Some schools even go so far as to send students home from clinical if they don't have 100% white shoes, or their uniform is dirty/wrinkled, etc. I have no doubt that in some nursing programs, wearing an ill-fitting uniform would be considered quite unacceptable- by the nursing school staff, no less.
OP, a good seamstress can alter just about anything. I could definitely not sew my own uniform, or alter it in any way that would make it look professionally done, so I definitely suggest bringing your uniform to either a professional or a friend/family who is talented with a sewing machine. Just take the uniform in with you and they will fit it for your body and make it look great!