Commander size 1911 in a CompTac MTAC:
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Sorry for the blur, didn't feel like uploading again:
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My two o'clock from CompTac is a lot more uncomfortable than I expected with my Taurus PT111, but it works. I went a whole day working on Habitat homes with it under a size large t-shirt with no problems except when I had to reach up to paint the walls edging the ceiling. Consider this, though, a size large on my frame did not stick down as low as your shirts do, so you may not even run into a problem with reaching either.
Editing to fix pictures, trying to make them a bit smaller.