Line drying is especially good with knit wear or with shirts that have a little bit of stretch to them. Often the dryer, especially the front loading dryers that we all love so much, are hard on the clothes and gets them moving around a lot. That can cause some of that fine pilling that you get with knits. There are some fabric shavers that you can use that will help with the pilling, but if you can avoid drying, then that's the best.