Who needs special clothes for fly fishing? You do. The sun isn't going to stop itself from giving you the worst sunburn of your life, so you're going to have to get some UPF clothing to handle that. Or you could just spend the same amount of money on aloe vera after the fact, with nothing to show for your fishing trip but a lot of pictures of you looking like you had a bad experience at a tanning salon.
Yeah, we'd just buy the sun shirt too.