It is a bit of the intimate question. Do boxers/trunks/briefs have to match with either undershirt or pants? I prefer white undershirts since they don’t show through both light and dark shirts. However, I don’t like white boxers as they don’t match with my grey or navy pants. That is the reason I prefer to match my boxers with pants. However, both white undershirt and boxers look perfectly coordinated as opposed to the case when boxers are grey/navy and undershirt is white.