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.