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Personally, I think a blazer in completely informal setting, or the blazer/tee combo, is for faggots.
If you're skinny or in shape, wearing button-downs with slim or skinny pants will make your shoulders seem broader. Unbutton the first button for standard use, the second for sex-mode. Rolling up the sleeves will make your upper arms seem larger too. Buy henleys, scoop necks, v-necks if you have to (although everyone and their mom is wearing them these days). Male sexy acheived without over-doing it.