My bra sometimes does, and sometimes doesn't. I generally wear the same style of pants (when I find a style of slacks that fit correctly, I buy multiples), same style of (underwire) bra and even if I have no earrings, watch, or metal necklace on, I have set of the WTMD at least twice since October 31st (one other time earlier in October I MAY have had small metal earrings on).

I've debated about pulling a 'Jennifer Beale' (remove my bra without removing my top, ala Jennifer Beale in Flash Dance) if it happens again, but that just may cause me to be selected for additional pat down because of 'suspicious' activity, and I REALLY don't want a pat down while braless!