We were there around Christmas and didn't have the option to get a woman's cut tshirt, and yes they shrink terribly (sorry, not dissing on the tshirts - we appreciate them!!!). I got a medium which has now turned into a small or extra small. However, I will say that CSA has the best selection of resort apparel I have seen (haven't been to CTI so I can't speak for them). I got the most awesome black tshirt with the silhouette of a couple on the front in red, green and yellow and on the back it has Couples Swept Away on it! (When I say resort apparel I mean ones you can buy in the gift shop).
The tshirts we rec'd this past trip were the "very important couple" ones. Luckily we already had some from previous trips since mine will fit a 10 year old now.
I would suggest being generous with the size because it will shrink. Better for it to be a bit too big than too tight to wear.
Melea & Joseph
CN - '06, '07, '08
CSS and CSA - '09
CSA - '10