Just as long as you don't wear your tights with cycling shorts on top and then underpants on top o' that, everything should work out just fine
Funny you should mention that . . . At the Konocti Challenge a few weekends ago, there was a gal riding with a pair of bright pink undies on the OUTSIDE of her cycling shorts!
I am a year-'round chamoised shorts underneath non-chamoised tights kind of gal.