I've logged a lot of miles on various bicycles. Bike shorts are perfect for that, but less than perfect for motorcycle riding. The wicking is still good, as are the flat seams (totally beats cotton). The only thing about the bike shorts that could be a problem are the pads. If you're sitting in a deep seat, they tend to hold a bit more heat/moisture than they do on a bicycle (where you get lots of airflow). So I'd go with a very lightly padded pair, or no pad, especially if you already have a cushion of some kind on your seat.
MF Battery, Iridium Plugs, RR relocated, Voltmeter, 170/80/15 Kenda Kruz rear tire, DIY Samsonite hard bags, DIY shaved seat with Beaded seat pad ('cause that's how I roll) and the dreaded STATOR CHANGE.
Shining Black Bess '86 VN750, retired for parts after a fried stator and being knocked (kee-runch) in her parking spot.