If you're sweating at all whilst using this stuff, it's not a very good antiperspirant. Antiperspirant is meant to stop or reduce the amount of sweat you produce where you apply it. Secondly, if it is an antiperspirant, that does not necessarily mean it's a good deodorant too. Furthermore, wearing a tighter shirt (one that is possibly made of artificial fibers) will not allow your body to breathe, therefore increasing the amount of odor produced by your body (it gets trapped in the fabric). Beyond that, what are you washing this tight shirt with? The fact is that odors get trapped in fabric easily, and the wet heat of an armpit could possibly trigger previous odors already there.
My recommendation? Find a new product and wear clothing that fits, but isn't tight. Wearing natural fibers instead of artificial fibers also helps. As for a new product--make sure it is both deodorant AND antiperspirant. Some people recommend even going so far as to use two products separately (namely Kyan Douglas from Queer Eye) to get the maximum effect. This would possibly allow you to acquire a stronger antiperspirant than you would get with just a deodorant.
Good luck.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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