They are emotionally involved with the Organization.
They want to get ahead and learn as much as possible about the business. Instead of wasting their free time with a bunch of losers, they get to know their Boss and discuss business with him during Pillow Talk.
It depends what you mean by
"work clothes".
If you are going to train as a checker -
the store might have a Uniform for you.
In any case you should look smart because you will be see by the
Customers. Be sure to smile a lot.