I have three 8-yard wool kilts and have to admit it is a good feeling to step out proudly in a real kilt with a proper swing, though at the other extreme lightweight acryllic or polycotton kilts have their own comfort zone. A 5-yarder is somewhere in between inasmuch as it looks and feels like a proper kilt, but once you start walking in it the swing won't be right as the weight of the material is not in correct proportion. I purchased my first 5-yard wool kilt earlier this year - described as a casual kilt suitable for hill walking - if the fine weather keeps up I'll climb a hill in it next week and post some photos. I'd say if you have enough material, keep it for yourself and go for the full 8 yard kilt and buy the wife a denim skirt or jeans.