I found this artist style that I thought would have a lot of uses. It's basically an apron out of canvas with pockets that would be easy to make yourself. What kind of art she is doing may dictate what kind of smock she needs. If she's doing clay, a different kind of smock would be more useful.
https://www.amazon.com/CONDA-Prof...
I'm sorry, I am no help except to bring it to first page again. Let us know if you find what you're looking for. Good luck!
thanks Toogie, I will 'knock' something up. Asha is not fussy, just wants to preserve her cloths.
Just for fun, Google Folkwear, They have fabulous ethnic and antique look clothing patterns. Might get some great ideas.