Based on this Daf's concensus, it would seem that todays typical mens underwear should be classified as "chimum" as it fits snuggly to the ever? or is it?
Tzvi Stern, RBS
Standard undergarments today are acceptable, because the manufacturers specifically engineer the garment to maximize ordinary comfort, which precludes undesirable friction. (In contrast, undergarments specfically designed as "intimate-wear" that are constructed to arouse the man's urges would apparently not be permitted.)
Y. Shaw