how much fur do i need for dtd's?

I was planing on making a 3/4 suit. The pants are going to be digigrade.
I was wondering if you needed more or less when building off of dummies.

I made my first digigrade fulsuit, including a long giant tail, with about 8-9 yards of fur.
I also plan to make arm sleeves, and I'll still need fur for the head and everything.
I was hoping I wouldn't need as much if I'm making just pants on dummies.

Also how many ducktape rolls do I need for the pants?