What should I wear tomorrow to paint pottery with my friends?

We are going to paint pottery for a while and then shop.

An Apron is a good idea. you could also purchase scrubs(clothes medical people where, mostly Nurses from the dollar store fairly cheap. get a size larger than your clothes. If you are going to be using glazes a clothe face covering will be helpful since glazes consist of chemicals and turn to powder very quickly.
If its tempera paint then it does not matter. Tempera cleans up with water.
Latex will not stay. Eventually it will peel off.

And just for terminology sake, if you are using Glazes then its not called painting its called glazing.

How about something that is easy to clean?
Since when does painting pottery require a fashion statement?

your dads white shirts

What should I wear tomorrow to paint pottery with my friends?