I tried one time (can't remember why I even felt the need) to wear panties under my shorts and ugh, I felt awful. It nothing else, panties got wet and retained water while the bike shorts would normally wick away the wetness. Plus there was bunching and binding and all that. Just felt like I have on a big wet diaper.

I do have several pairs of shorts (well maybe more than that) so I never wear a pair again until they are washed. But I tend to get sweaty even on short rides.

Why would you wear panties under shorts? Is it a modesty issue? The shorts are designed to be modest enough. I do have some older shorts that are getting thin ( so see through in the back) so I make sure I use those for spin class or under a pair or hiking shorts while mountain biking.

I do have a friend who regular wears two pairs of bike shorts for both modesty and comfort. Try that instead.