It's not a very popular aesthetic decision anymore because of the increased availability of breathable fabrics. If the weather is too hot for a jacket, don't wear one. If you can't decide between a short sleeved shirt or a long sleeved shirt, wear linen, seersucker, or breathable cotton instead of heavy cotton or flannel. You can also try wearing lighter colours in general if you want to absorb less heat.
(And bro, stop hanging out with whatever dumbass frat boys thought calling you a "homo" was appropriate, or that being a "homo" was a bad thing. Seriously, it's not 2003 and you're not in middle school.)