Curiosity – there is certainly an inyan of tznius for men. See Rambam Deios 5:6 where this is clear: “צניעות גדולה נוהגים תלמידי חכמים בעצמן לא יתבזו ולא יתגלו ראשן ולא גופן”… Although there it is talking about a talmid chochom, but everyone has halochos of tznius in beis hakisei. (If you meant specifically stained clothing, then I agree, the Rambam there brings the halocho of stained clothing separately in halocho 9, implying it is separate, as you say).
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