When I commute on bicycle I always carry with my Kahr P380 with a belly band on my solar plexus. Even with a T-shirt it doesn't print at all, but that's probably because I am carrying the smallest 380acp on the market.
I have had to modify it to fit my magazine and to fit my particular gun with the cant I wanted. What I mean by modify it is take out my wife's sewing machine and go to town with the tactical black thread.
.45acp, .40 S&W, 9mm, .38 Spl, .380 acp, 22lr
12 gauge, .223/5.56x45mm, 30-30 Winchester
2 Chron. 7:14 Christians must seek His face