a pocket t-shirt under a shirt may work, but it is still getting up in the eighties here and still t-shirt only weather. i'm not sure a magazine in a t-shirt pocket would stay put in a threat encounter. from watching youtube videos of the antifa riots, victims are being attacked by ten, or so, people and wind up being beat, knocked down, kicked, hair pulled and dragged around (it's getting to the rodney king/reginald denny stage in some places).I have no idea how you dress have you considered a T-shirt with pocket under your normal shirt? You can slip the magazine right in the pocket
anyway, when the weather cools down i can start carrying my glock 19 under a long shirt or sweatshirt. and i think in this scenario a spare mag in a pocket t-shirt would be a good idea. the lcp is always in my pocket.
murf