Depends on the season. In winter it's a vintage 1980's shirt-jacket thing that I found in my dad's storage closet: red/black plaid, soft flannel exterior, thinly insulated. My parents had matching shirts and dad's old one fits me perfectly.
Pretty soon my favorite will be a thin blue cotton-linen button-down that's perfect for hot summer days. And it goes well with my big straw shade hat.
