Well I actually did it deliberately because I was going to finish it with bias binding but now I have changed my mind and want facing instead.
It's a back strap for a dress (two of them) so I'm thinking something like add some fusible interfacing and steal some from the seam allowance on the other side of the strap (which I fortunately didn't remove) but then my notches would be in the wrong place... Do I need to make a whole new pattern piece with 1/4" seam allowances at each side and recut from the existing pieces?
The problem is further exacerbated by the fact that my fabric is fraying like billy-o, hence the feeling I would need to add fusible or something to smaller seam allowances.
No fabric left to cut them again correctly, unfortunately.
Anyone got an easy fix?