It seems the new look for men's spring fashion is a resartus of the 1940s/Clark Gable/Howard Hughes/Harrison Ford thing. The key is rumpled comfort. Fabrics that require ironing, have received ironing, and have then had their creases interrupted by wrinkling due to lounging. Alas, even in thrift stores, you can rarely find that kind of jacket or shirt. You can, however, find some more recent vintage stuff using older synthetics that behave the same way. Discard the ones whose cut and color evoke the 60s or 70s.
Two weeks ago, I needed a black jacket for an upscale reception. (Down here, I have little more than t shirts and flip flops.) C found it on the rack at Out of the Closet, the wonderful thrift store in Wilton Manors (Proceeds from Out of the Closet sales directly benefit AIDS Healthcare Foundation. Think Housing Works gone south). It's not from the 40s, but it is a Botany 500 with good approximate attitude. I'm wearing it over a thin white Armani cotton/nylon shirt that demands ironing and sheds it the minute you move, and, charcoal Zegna jeans with subtle purple stitching.
The price of that classic jacket at Out of the Closet? One dollar and six cents.