I need the valance section to be wider than 28”, how can I alter them?
Extending the width beyond 28” will cause the pleat to droop. We cannot advice you on changing the pleat.

Can I make the valance deeper?
Only 3” more or less.

Can I alter the Jabot?
Only about 3”. It is cut on a curve; to extend a large amount would require the curve to change. We cannot help you with that.

Should I cut this valance on the bias?
No. This is not a swag. A bias cut will not be effective.

Can I use a stripe fabric on the valance?
Stripes are fine for the valance. The jabot and tail has a curve shape. Stripes will hang at a variety of angels. This may (or may not) be acceptable to you.

The instructions require the mount board to have “legs”. If I am not using the jabot, do I still have to use the “ legs”?
Yes. The legs are not there for the jabots, they are needed to give the valance something to attach to at the sides.

For a bay window, do I need “legs” at the inside corners?
No. make the bay mount board in one piece. Have “legs” at the outside ends only. Make the valance in one piece. Plan for a tail to be at the inside corners.