Thanks, everyone :-) I didn't use a pattern; it's essentially 2 piece2 of fabric folded in half. I just sewed where I wanted the pockets to be and then made a channel near the top for the elastic. I used a wide mouth pint jar; just measured around it to get my measurements (about 16 x 5 folded for the apron and 16 x 3 folded for the pockets. )
It's just handy - I can move it around, but the jar has enough weight that I'm not knocking it over.