MarthaK,
I used some "polar fleece" material, cut it about 7.5" wide, and about 6" longer than my bow (use the extra length as a fold over flap to hold the bow in)
Hemmed up all edges to prevent runs and fraying, then folded the material in half and double seamed all edges and the bottom and top. This makes a totally enclosed bag. Took a razor knife and carefully cut through ONE side of the bag, about six inches from one end, and then crudely hemmed this cut by hand stitching (I am a horrid seamster) to prevent runs and fraying.
The sox opening could be cut and hemmed before the material is folded over itself for a better appearance.
If I make another, I will double up the material at both ends, to provide more protection for the limb tips.
Hope this helps. Oh, the measurements above are for a longbow. For a recurve, you would probably need at least 10" wide material.