Maybe this doesn't need its own thread, but I just want ya'll to know that adding a crotch strap has been a game changer for my buoyancy and comfort. Last year I was on the Juliet (Bahamas liveaboard that I highly recommend) and the captain recommended it after I complained about my BC coming up around my ears when I tilt head-down. She even found one and installed it on my BC (I LOVE that crew!). Now I hook it up at the beginning of a dive, cinch it to the right spot when I get in the water and my BC stays exactly where I want it whether I go upside down or tilted (to look under shelves or take pictures). If Liza hadn't recommended this I never would have thought of it on my own - so I thought I'd mention it here. Especially as some of these BC's aren't easy for curvy figures, it's a nice way to keep it all in place.