What to wear to mcdonalds second orientation?

Wear a housecoat, platform shoes, and a beanie with a pinwheel on top.

I say there's no harm in asking your trainer or supervisor. Just give them a call at the store. I would think they would have told you if you actually needed to wear your uniform this time but they could have forgotten.

Wearing you uniform is good.

If you aren't supposed to be in uniform, I say black pants or khakis and button down dress shirt.

Wear your uniform. This orientation will be different in that you will likely begin training on whichever job you are to be doing. (Cook, cashier, whatever.)