In that case, I'm nowhere near cool enough to be 'on trend'. I did see a teenage boy of about 15 wearing a onsie in A&E last week and he didn't seem remotely embarassed. I'm aging rapidly, I'll have turned into my dad before long.
I was 'cool' today. Wore shorts....sandals and no socks....more cold than cool....happy to say I have never been on trend....or trendy.....I am proud to be a square...or rectangle!
I thought wearing pajamas out was 'on trend.'