This question might be aimed more at oil and acrylic painters rather than watercolor painters. Do you have specific clothes set aside that you don’t mind getting paint on?
In years past when I tended to get paint on everything, I had specific old clothes set aside just for painting in. These old clothes would get covered with drips, spots, and splashes, which became stiff with dried paint – not so much fun to wear. I’m not as messy or drippy as I used to be. These days I tend to wear regular clothing that’s comfortable, although not anything new or expensive just in case something spills or drips. Sometimes I remember to put an oversized old shirt on top Certainly I don’t look as dapper as Monet or Picasso do in these old photographs.
What do you wear when you’re working? Do you wear old clothes? Do you wear a protective layer like a smock or coveralls?