the welt seam simply folds over before you stitch it in place. When to use a welt seam: wet seams like flat-felled seams are perfect for jeans and can be helpful for curved edges, too. In ...

In and out. In and out. Mia: Nice work! The smaller and more equally spaced the stitches are, the stronger the seam will be. Don't pull too tightly or the fabric will bunch up, keep it flat.