Well, I completely sympathize with all of the diminuitive women out there! I am 5' 1 (and 3/4"!) and about 105 lbs. I have the same problem with my bee suits. I have a tyvek suit, that I used to use for painting. I had to buy IT from a safety supply company, so that it would fit me.. It has a tiny gap at the back of the neck that the bees found for me, so I bought a Dadant suit - x-small- and it is enormous - but no gap, so I switch between the two. You will find out that Tyvek, although lightweight, doesn't breathe, so it's not ideal.
I completely agree with Leominster about why the sizes are so big.. I had the same problem when I tried to buy a pair of denim overalls several years ago, while visiting the in-laws in Iowa. I guess that many farmers and beekeepers have similiar bodytypes..
Mellifera