Check out the two options below:
The linen blazer would definitely be my first choice. Plain, basic, understated, and most importantly, breathable. It can go with just about anything and be worn just about anywhere. It's also a good step up from cotton in formality.
And while not my first choice, this madras jacket is certainly more bad-ass. I swear, I think my favorite color is plaid. The jacket looks sharp, and I think RL Rugby may have some madras blazer competition.
Either option looks like it has working button holes, which is a great detail. LL Bean is stepping up their game and while the initial line-up was a little lackluster, newer items like these is generating some great attention.