|Interfacing can change the shape of a pattern piece.
If you fuse or sew in interfacing always double check the interfaced/fabric piece by laying the pattern tissue over it to see if it has retained its shape.
After making several bags/purse recently, I was amazed to see how much fabric grows and changes shape when I sew non fusible interfacing and when I press fusible.
In most all cases, I had to recut, not alot but enough to make a difference.
The best solution when using fusible, is to fuse block by ironing the fusible to the fabric before you cut the pattern out.
With non fusible, you need to double check.