Another summer favorite, again cotton, but instead of madras and all it's patchwork stitching, seersucker which is just as comforting. These thrift stores are producing some great finds. This is an especially good example because of the details.
Jacket body is lined in cotton, sleeves in a rayon and with Hong Kong finished edges
Cuff with vent and functional buttonholes (although mine would be prettier with my vintage buttonholer)
There is no reason you can't use a basic jacket pattern and add these details.