What type of clothing do people in Idaho wear?

Being an Idahoan, I should know :). We almost always dress in layers, even in summer. The weather can change in an instant here. You see a lot of jeans, short-shorts, and hoodies...but clothing depends on you're lifestyle. Manual laborers (plus a few ranchers/dairymen/etc.) are common; work boots, jeans, and a t-shirt. Most everyone has a jacket with them though. So yeah, basically just normal stuff.