Hi im female, also size 8-10 and iv been wearing a s/m beaver oversuit which is now on ebay, great to get startes. Otherwise you can pay ?80+ for a new 'female' sized suit.
Its plenty big enough around the wait and chest, the only thing that maybe a prob is the length of legs n arms, im 5'6" n it fits perfect on the arms but is a tiny bit short on the legs. However being a caving suit not a fashion item it didnt bother me and also stops you walking on lebgthy legs lol