I wouldn't bother with a pattern. I've seen them, but if you don't want a hood, it is ridiculously easy, especially if it is just for fun and not something that will be handed down in the family forever. I would measure an idea of how wide you want the bottom to be (like, say 2 yds for example), how long you want it to be (you could do a shorter one and just pick 2 yds of 45" fabric or you could turn the fabric on it's side so the selvage is perpendicular to the ground and sew as many pieces together as you need to make your width measurement) then it is just a matter of gathering the top and sewing a casing over it (like apron strings) and you are done. Use wonder under to cut and apply the words or get iron on lettering. You could even alter an apron pattern (the kind that just go around your waist) if you want a little more of a walk-thru. You could line it if you went with idea #2 and didn't want the seams to show on the inside, though if you serge/zigzag them, it isn't going to look bad anyway.
I'd use easy to work with/inexpensive fabric (no nylon or stretch). You can find lots of options in weight and print on clearance tables...
