Twinklady Rain Jacket Women Windbreaker Striped Climbing Raincoats Waterproof Lightweight Outdoor Hooded Trench Coats

My Wife is 5.6' and 130lb. What size should I get ?

Is it washable?

Is this jacket good for getting across campus in the fall weather? Temps will be dropping soon so I dont want it too light weight for Michigan autumn.

how do I exchange the navy blue raincoat for a navy Large?