I like the fabrics in Giordana and RLX...almost identical. Both also make XS (p&pwoman). I like the Zoic stuff, when I can find it...last year, Marshalls had a slew of the Zoic's for a great price...Zoic riding shorts have plush retro lining instead of chamios which worked just fine on a MB.

I wear other sleeveless stuff just for spin...Asics, Danskin,
Avia runners tops. Work well in case the room gets too hot and I have to throw it off down to the runner's bra level. Then, again, I like the rlx support bras because they "cover" everything well.
Terry