This is a 4mm...but man what a price!
Neo Sport 4/3 Womens Full Wetsuit reviews and discounts, Neosport
If you aren't concerned about someone telling you, "Your wetsuit is soooo last season.", these might be an option.
Henderson Thermoprene 5mm Full Suit -2007- Womens -BLUE ONLY reviews and discounts, Henderson
Henderson Thermoprene 5mm Full Suit 2007 - BLACK ONLY reviews and discounts, Henderson
This one has a hood attached. Some people like it, some don't.
Womens Mares Origin 5mil Full Suit With Hood reviews and discounts, Mares
As for sizes, the ST gang can figure it out for you if you give them your measurements. But just for reference, I'm 5'3" & 108lbs and I wear the Henderson size 6. Have fun shopping!