My DDs and I was through Marks just for the lol's. We point and laugh and ask why? I think they must have two departments who design the cloths, the first department designs the normal clothes which they the send to the second department who Marks and Spencer'fy it by adding very random details such as a wacky frill here or a crazy ruffle there (basically by making it ugly) . It's madness.
Knickers, bras, Jammie's and sportswear are all ok but other than that it's dire.
OP, you are not being unreasonable.