I am assuming it belongs somewhere in the 60s to 70s but I thought I would ask to be sure. I think it might be linen. It's heavy, lined, with a back plastic zipper closure with 3 buttons and little front pockets. Thank you!
nice - that square seaming on the front is quite a mod feature. I would say mid to late 1960's. I'd suggest the hem wasn't original as it's very rough and the only nylon thread blind hemming I've had on a commercial garment was done by machine and the nylon thread sewing here appears to be hand sewn.
I agree with mid-'60's or slightly later. It can't be earlier than 1965: https://vintagefashionguild.org/label-resource/kasper/
Agree with '60s and that nylon hemming thread was popular in the '80s so the hem might have been adjusted at that point.
