It's a month early in the season for the hat in the illustration, but if you are in Northern California and happen to see a man attired like the guy in the illustration, say hello. It's probably me.
I probably over-do solid tan odd jackets. Tweed patterns in mid-weight worsted for warm weather wear have always seemed like a bit of a perversion of purpose to me, so solid linen, fresco and gabardine make up most of my Spring and summer odd jacket wardrobe.
And when I'm looking for something to wear in a weight between a heavy tweed and a warm weather jacket, I reach for gabardine. It wears too warm for hot days, but it's perfect for temperatures in the 60's and 70's (farenheit). Add a shirt and a light-weight pair of gray flannels and I'm almost ready to walk out the door.