I had someone tell me the best way to make them is:
1 yard for baby
1.5 yds for small child
2.5 yds for average adult
3 yds for someone who is tall.
Measure in from the edges 3 or 4 inches. Put masking or painters tape all the way around the fabric. Where the tape crosses at the corners, you cut that away. Clip up to the tape, all the way around. Do this to both pieces of fleece. Then tie the 2 fabrics together with double knots. BOOM. DONE!!!
Hope this helps.
(I use to work at JoAnn Fabric and have cut and sold a lot of fleece, and thyall say this is the best way to cut and tie. Then this way, they are all cut the same length) ????????????
Bev
By the way, I have never made one myself but have had a lot of people tell me the same thing.
Hope it helps.