I have a two tone XDm (silver slide) and find that most times it v very noticable. But along the same lines as you, I have a light green plaid button down short sleeve shirt, and the firearm just seems to dissapear, I rarely notice any looks from people while wearing that shirt, and a full size XDm isn't easy to hide to begin with.
I find no problem with it, what if you have a camo painted firearm and wear a camo outfit? Same thing to me, legal. Not my fault your eyes can't distinguish what's in plain sight. At least that's my opinion, there could be some weird caselaw that noones seen in 30 years that proves me wrong. >.<
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