I have a couple of RTW tops that have the neck trimmed with pleated, toning, woven fabric. The trim in both is cut on the bias and not finished. On one, it's just about 1/2" of the pleated fabric sticking up from the inside of the neck. That one is a semi sheer fabric. The other one has about 2" pleated and sewn over the neckline in two seams about an inch apart. I like that not only does it have a bit of texture from the pleating, but the texture of the fabric is different too.