Another difference is that material cut on the bias will stretch more than the same length cut on the warp or weft of the fabric.

This might make them more comfortable when worn, though the stitching might be a problem as it might snap under the tension. Using a zigzag stitch on a sewing machine might give enough stretch, or there are some machines which do straight stitches with built in elasticity for things such as knitted fabric.

Anne the Pleater