Some trivial question 0_0

[pevampire.livejournal.com]

I know this is really trivial (and somehow stupid...) question but ever since I started studying European history
(at school) I've always wondered...especially for 18th century......

aren't those three piece suits er.....you know......hot? for summer? 
Did they wear the same shirt+waistcoat+frock coat in summers??? or were there some kind of summer suits...?
Those clothes seem really er....tight 

Most of the Asian costumes, with their billowing sleeves, aren't THAT hot........but.........