I actually modified some of my son's used sneakers for jester shoes a few years back. Pretty easy, didn't need a pattern. Just made 4 left and right sides , sewed them together and left the bottoms open. Stuffed the toes, inserted the shoes, and then glued the fabric onto the bottom (sole) of the shoe. Glued a piece of leather onto the bottom for a new sole. Finished the toes with a bell.
They lasted quite a few seasons, and the only cost was about a half yard of fabric (we already had the bells, the leather and the contact cement). The fit was beautiful, as they were broken in sneakers.
Something to think about.