I just did a couple for the mail carriers -- used soil moist too, but used 1/4 tsp/4x4" section. Got some favorable thanks, so guess it worked OK. Had a shorter piece of fabric on one, so styled it more like a large collar with a button at the neck. The lady said she liked that better than the tied ones because it didn't get her work pieces (mail) wet.
Am going to make a couple for me now just for gardening.