thinking about this http://www.yoox.com/us/49129219TB/item?dept=men#sts=sr_men80&cod10=49129219TB&sizeId=
but I just dont know.. I feel so uncomfortable buying suits. especially off the internet
Ouch. Def. not anything with poly/synthetic fiber. You'll roast. I'd go with cotton, linen, or super lightweight (tropical) wool if you need to be a little more formal. I have an off-white cotton (Boglioli) suit, totally unlined, for those types of hot, outdoor daytime things. Can you get away with no tie?
As long as there is a good return policy/reasonable shipping, I'd not worry about buying online.