I can’t say pack layers enough. Whether it is summer or winter, the weather in Jackson Hole is unpredictable, but there is very little need for fancy dress clothes. In the summer, I would recommend bringing at a minimum:
- A Waterproof/windbreaker jacket
 - A sweatshirt
 - Sandals and possibly water shoes depending on your interests
 - Sneakers
 - Hiking Boots that are broken in
 - Lip balm (your lips will get chapped)
 - Sunscreen
 - Insect repellent
 - Mostly short pants
 - T shirts that wick (microfibers)
 
In the winter I would suggest making sure you bring: