Weathering Clothes with Weathering Powders

[Matthew Gresham]

I had the idea to make a cosplay shirt look dirt using weathering powders, but does anyone have any tips for how to make the powder stay in the fabric through washing?

 

[PHArchivist]

Pretty sure the industry uses Fuller's Earth (you probably have heard that too); just nt sure how permanent it would be.

Coffee or tea staining, perhaps?