This has to be the oldest of my UFOS. It's a blouse (I think) cut from Butterick 3702 and size 12! It's many years since I could get into a sewing pattern 12.
The fabric is a thin, lining weight synthetic, probably polyester and there is a back, a pair of fronts, two sleeves and two collar pieces together with a rather too heavy interfacing. I'm not sure if there are supposed to be cuffs.
This one is very unlikely to get finished.