How can I find my size before I go shopping.   I'm pretty hrt and decided to ditch my boxers for good in favor of panties full time. Lace Boy shorts are my fav.

Also any suggestions on brand?  Maybe something that will make my butt/hips look a lil bigger?

Also, any suggestions on hiding myself comfortably in them?

Oh I love boy shorts, too bad something is in the way down below but I digress. To give you a comparison I wear a size 5-6 in women's underwear that have some elasticity to them and I fit just fine into a men's small fruit of the loom briefs. I never ever could stand to wear boxers I just never felt right in them. It took me a few tries before I found the right size as I first ordered stuff that was way too large so in a way it felt like a victory being able to fit into the smaller stuff than what I thought I needed. Generally when I want to keep things tucked away I wear the size 5 panties with a size 6 on top of that for extra hold.

I'm wearing a size M/M Calvin Klein half thong(the kind that don't look like it at the top but it is). I want to get some snug boy shorts just dunno size.

All the underwear I ever bought was sized in S/M/L etc., and when I started getting men's boxers I wore the same size. So if you were a size M in your old underwear, you should be a M in women's.  That's been my experience at least.

I've found that you have to move up a size.  I was XS in Men's (Basically impossible to find), and I found that S fits pretty perfectly in Women's.  I gained some weight and later became a S in men's and now find that M in women's fits fine.  Of course there is elasticity in most underwear so I could easily go down a size without harm to my circulation.