I had no idea they had a single-length trouser size. How does that work? Did I luck-out that they happen to be the perfect length for me, or is it directly tied to waist size rather than a global single-length?

I first came across Uniqlo when I was in Japan, and their "shove everything in this box and close the door to scan your items into the self-service checkout" impressed me (as an Engineer, I enjoy these things). They recently, in the past year or two, caught up here in the UK and the store I visit has them now.

Also I find their face masks to be the best fitting and most comfortable out of the many, many brands I've tried.