Uniqlo/JW Anderson Oxford Oversized Shirt
I have five of these in different colors. I buy in L or XL, kind of for no reason. You can wear them in any weather, they are polished enough and well you don’t have to worry about them being too small at the end of the shoot.
Pockets
Maximize your pockets. You need as many pockets as you can get.
You can usually get a parka from costumes
Obviously you should be nice about it. And you have to give it back eventually. But like you really can’t always predict the weather.
Technical-ish pants
Useful if it rains. Baggy is better bc more comfortable imo.
