Choice 1: Hanes colored briefs. The thick cotton, not the "single ply" white ones.
Choice 2: Hanes trunks. Like a boxerbrief, but shorter legs, with no leg-opening-elastic.
Choice 3: Other assorted brands of trunks or boxerbriefs, pumas are lovely, 2xist, CK, whatever strikes my fancy while rifling through the racks at Marshals.
Tried the target brand, Merona, and was dissapointed. Used to have some nice Jockey stuff but it wore out and they don't make the ones I like anymore.
Or a jock.