I only have few pairs of the new F Class (old and new) and have to say the old ones are much nicer. I gave the old style polo top ones to my elderly dad with the slippers who enjoys lounging in them. also have a few pairs of J class ones and they have never shrunk..perhaps the J ones are pre-shrunk?

I use and re-use my J ones lots and have worn them with much pride on Cathay, Royal Jordanian, Etihad(during QF partnership days) and Royal Brunei J flights (despite weird looks from crew and pax - esp on RJ

Gotta love that big roo on the front.