The Church recently updated the missionary clothing guidelines to give permission for missionaries to wear wide-brimmed hats and sunglasses to provide protection against the sun.
These changes are welcomed ones that will help missionaries to fight against the issues that could effect them. Sunglasses are known for protecting your eyes against UV light. Plus, if you spend 3 hours in the sun, it can effect your sight once you come indoors or move to a dark location.
Meanwhile, hats are definitely back in style! Wide-brimmed hats provide protection equal to an SPF of approximately 5 for your nose, ears and neck. Who doesn’t want a bit of extra protection to ward off a sunburn?!
Here are some examples from LDS.org:
While both the style of hats and sunglasses must be conservative, this change is a welcome one, especially when serving in areas where you spend a lot of time outside.