I am looking into getting a couple fairly inexpensive sport coats. Initially I was looking to get 100% wool, but I read that including a percentage of polyester under 20% can increase fabric strength and minimize wrinkling without greatly affecting look. I am planning on wearing them a lot so I thought it would be good to have a slightly stronger fabric. I know a larger percentage of polyester can make a jacket look cheap, shiny, and plasticy. Is it true that it is ok to have a lower percentage of polyester, like 15%, without ruining the look of the coat?