With the vest at our store its kind of an emergency use only (called in a TM who didn't have time to go home and change or a starbucks TM coming out to the sales floor), I know in California and Washington the labor laws are a bit different and you are allowed to wear whatever you want under the vest. Shorts are pretty much reserved for cart attendants only; unless you have a laid back STL. If your backroom is too hot make sure to have your TL/ETL partner with facility management. The SFT can take temp/humidity measurements and if its not within a certain range they can have corporate authorize temperature overrides.
we can wear only pants at our store or skirts if you don't wear pants, the skirts have to be a little past knee length. shorts are for kart attendants only. our backroom is always hot i swear they don't turn on the ac back there at all. if you are working overnight you are allowed street pants and a red shirt. anything can go jeans sweet pants as long as you have a red shirt. you can wear any colored shirt under a short sleeve ( winter or a vest but the outside shirt has to be red)