The Selvedge Stripe
We’re thinking of that red, white and blue stripe running down the outside of the cuff. If it looks familiar, it’s because you’ve seen it running down the outer cuff of a few hundred pairs of raw denim jeans, looking something like this.
Of course, there were industrial reasons for that stripe (specifically, the red thread that marks the edge of a sheet of denim), and this is just a trick of style. But as tricks go, it’s a pretty good one.