Originally Posted by
jjgman5
I like to fly in "Normal" clothes, a.k.a Jeans, Nice Shirt. - in any cabin. My brother on the other hand (he's 23), loves to wear some sweatpants and t-shirt, especially when flying in INT'L Premium Cabins

When flying with other other passengers often try to board before him, but he stands his ground with a J/C class BP.
Domestically in the US, F pax come dressed every which way. Intl F pax tend to get dressed up a little bit more, but sometimes not by much...my advice is to come as you are and the FAs will deal