Hey McD,
Not sure where in the Midwest you are, but guessing its too hot for a sportjacket. Sportjackets and suit jackets are too long for wear with kilts...you lose a lot.
I like sweaters or vests when its cool enough, just shirts otherwise.

Here's a pic of my forest green AmeriKilt with a Pendleton vest.
There are more ideas in my imff gallery on page 2 in the AmeriKilt album if it helps any.
Ron
Ol' Macdonald himself, a proud son of Skye and Cape Breton Island
Lifetime Member STA. Two time winner of Utilikiltarian of the Month.
"I'll have a kilt please, a nice hand sewn tartan, 16 ounce Strome. Oh, and a sporran on the side, with a strap please."
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