I have the US 501's and they seem fine for my chook legs! I just checked the labels on them and they are all the South American manufacturers.
It's just a matter of acclimatising as I suggested. Mind you, with SE (sorry, SMS, Strong Eagle) and all his potential new phones, you'll see a bulge in their pocket that would probably bring any pair of jeans or shorts down around your ankles in no time !!!

Sorry SE, couldn't resist that one!
In short, bring your jeans, IMHO - you'll adjust when we have cold days!!
HTH, Mr. P