Measure a skirt

How many yards of fabric for a skirt?
- wide of fabric 36 in - 47 in
(Length of skirt x2 ) + 10 in = fabric you need
   EX: Length skirt, Measure is 19 in then (19 in x2) +10in = 48 in (1,5 yards)
you buy 1,5 yards of fabric
- wide of fabric 60 in
Length of skirt + 10 in = Fabric you need
    EX: length skirt, Measure is 19 in then 19 in + 10 in = 29 in of fabric