I'm starting to wonder if the fibers found in the paint tray are from Patsy's jacket at all. A red, black, and gray checked jacket is quite a bit different then a red one. If the fibers are acrylic, as stated, there really is no need to dry clean. As long as you don't dry them in too high of a heat for too long, acrylic is fine to machine wash. However, it appears that the fibers were dry cleaned. They asked John about dry cleaning his black, wool shirt, too. So, if there were both, wool and acrylic, dry cleaned fibers taken in as evidence, it could tell us that the killer is fastidious in his dress and dry cleans clothing that doesn't even necessarily need it.

Acrylic has a lot of the same characteristics as wool. It holds the heat close to the body, resists moisture, and is breathable but is an easier care fabric and less expensive. An outdoorsy kind of person who spends time in cold weather areas knows that wool and acrylic are the best fibers for clothing to wear.