I have the opposite problem. I can't find tank tops short enough for my short body. I just ordered 3 Merrell tanks, from STP, size x small and as soon as i unwrapped the first one, I knew it would be going back. They are at the bottom of my hips/top of thighs and the halter strap is loose and floppy.
If the bottom of the tank doesn't fall in *exactly* the right spot, it makes me look awful. My hips aren't huge, but I am a woman... being short doesn't help this. I noticed that while some manufacturers make petite sized bottoms, no one sells petite sized athletic tops and tanks. This would solve my problem. I don't sew, so that is not an option.
Nike usually fits me, but they are rarely on sale.