Yeah, it's been in the 80's the past few days, but it ain't summer yet. Enter the shirt jac, or over shirt, however you want to refer to it.
Below, a few of my go-to's.
1)Engineered Garments poplin BDU w/ Apolis Activism strip pocket tee
2)Apolis Activism chambray snap front shirt jac w/ levis bd
3)Folk cotton overshirt w/ J. Crew lightweight cotton bd & Hill-side selvedge covert twill tie
4)vintage USMC herringbone twill mechanics jacket w/ Engineered Garments open weave plaid workshirt