I'm 6' 1", and at the point of starting HRT, I weighed 145 lbs, with a BMI of 19.1, which is just on the verge of underweight. I'm skinny. I hardly have any fat at all on my body, other than maybe a couple extra pounds on my tummy. I wear size 4-5 bottoms (low cut jeans, skirts, and panties, anyway), and I can probably get away with a size 8 dress, as long as it's sleeveless. I've gotten up to about 150, last I checked, but I'd really like to be up around 170, I think...so long as it all goes to my hips, ass, and tits. I currently measure about 33A-29-36.