Re: Opinions please abuse or different parenting?
most of it sounds cultural.
but you might want to address the helmets and carseats - they just might not understand that they can get in legal trouble for it.
After that, if they want to play with your kids, they need to play by your house rules. So, that's what I'd require. With any kid. From any culture. At any age.
If you're worried about being offensive, you could probably get some pamphlets about both items from the internet or police department and leave them on their door.
As far as the clothes, well, unless the child looked bothered, I wouldn't worry. If they look cold or are shivering, then you might take a different approach.
SAHM to Magnolia May (09/10) and Luke Russett (04/13) and wife and best friend to my airman.