Ah, I don't wear underwear under any workout wear... not just bike shorts. Never have, even way before I was a cyclist. Ouch, can't imagine wearing panties under running shorts or yoga pants any more than under cycling shorts.
I agree with Jolt, in that I don't think the underwear showing look is really cool, but I usually only see that on teens.
Shooting Star, I would *die* for some of the clothing my mom had in the fifties and early sixties. I have her "going away" suit from her wedding. Dark navy heavy wool suit. The skirt is plain A line, but the jacket is lined with some kind of navy fake fur, it's on the cuffs and collar, too. It fits me pretty well, but the skirt is a little tight. My mom weighed about 85 when she got married .