You get sized for it and can order it in the beginning of training. They do one of those things where you get an "allowance" of company money to spend, but really the company keeps track of how much you spent and excuses you from the debt at a rate of $17.50/mo (maybe per pay period?). If you leave before your allowance is fully paid off, they take the remaining balance out of your last check.

As far as during training itself, no uniform/luggage necessary. Business casual dress and backpacks are the norm in the training center