Two days ago I posted this question on r/Camping on reddit. I sit outside and smoke cigars a lot and was looking for a decent durable warm blanket for outdoor use.
Based on the replies the camping community gave me I decided to buy a sleeping bag instead. It was recommended in one of the comments that a sleeping bag can be used as a blanket, is usually warmer than a blanket and repells dirt better than any blanket.
I found this warm weather oversized "plus sized" adult sleeping bag that looks like it'll do the job. It is only $27 bucks on amazon and has a 5-star rating.