16 oz = 1 lb
If you have material that is 16 oz and 60 in wide, it will weight 1 lb
For a kilt you rip the fabric down the middle to make 8 yards or 4 lbs for a kilt. This is an approximation as lengths of kilts vary.

Types of material:
Poly-Viscose (PV or Polyester Rayon) is usually 10 oz
Acrylic is fluffy and some call it wool weight (this is only in volume not weight)
Wool kilt material should be 13 oz or 16 oz