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No_Summer620 posted on r/mtf1w
https://a.co/d/0bv5xgLd This is an Amazon link to an undershirt with a built in shelf bra. If you get one a size smaller than you'd normally wear it should have some compression without looking like anything more than an undershirt. The neckline and racerback style is admittedly a little bit feminine but hopefully no one would notice. I haven't actually tried this brand but I had something similar when I was first starting out.