I don't have time to order anything, so I will be visiting some stores. My LRS has two Mizuno compression tops on the clearance rack, small and medium. They think it will likely be too warm for my purposes, but will swing by and try them on for size. As it is May, I suspect that I won't have much luck finding a LS compressive top at Target/etc, but I will check them out. I should have expected the temps to turn, but we've been in the mid-80's! I've sent a heads-up to my event partner, she's never done this before either so we are both babes in the woods If I have to I will risk going to Athleta and see what they might have on their clearance rack, but that is a DANGEROUS store for me to enter!