Go to Play-It-Again Sports and you can buy a 1 piece undergarmet (meant for hockey) but works great with suits, I just started using it.. $19.99, the PUG and Nike/UnderArmour brands are hella expensive.
the only downside is its longsleeve and only 1 piece available, but some alteration can be made to the sleeves at least if you really want to.
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