I don't think you can't be comfortable, I just think they're less comfortable. No one spends a lazy Sunday afternoon on the couch watching TV while wearing a suit, if they were more comfortable than other clothes this would be common. Either way your solution of getting better suits or a tailor is an unnecessary expense I can do without.
As far as signalling goes it generally means the opposite of it's intention to me, if I see someone in a suite I'm more likely to think used car salesman, mormon or boss. I'm immediately much more skeptical and defensive because they'll want to sell me something or control me.