I have the trousers that go with the shirt. I was very impressed with them.
the loops at the hem are to attach to your trousers (there are matching press stud loops at the waist)
I practically live in mine.
I know there are one or two people on BCUK who threw thir teddies out of the cot over this particular celebrity endorsement, but a decent piece of kit is a decent piece of kit. It doesn't matter whos name is on it.