Yes you can wear a skull cap under a ski helmet.
some where "skull caps" which is like a compression type of material but in high school its a rule that you can't wear anything under your helmet
Nope
Possibly because she's famous?
It keeps the sweat out of their eyes. Football players sweat a lot under those helmets and when they take them off, it will roll into their eyes. Some guys wear the skull caps under their helmets for the same reason, and so that their helmet doesn't pull their hair out when they take it off.
Helmets have always had earholes in football.
Skull cap, like from under armour
A Du Rag under the helmet underarmour shirt and compression shorts with some hood tube socks
You can wear a thin, snug-fitting sports cap or a headband that can fit comfortably under a horseback riding helmet. Avoid wearing hats with a brim or bulky designs as they may affect the fit and safety of the helmet.
In CA you can. Other states I don't know. In most states you can only get a ticket if you are under the age of 13 and without a bike helmet, but again, this varies between states.
You can, but most players don't. If the helmet is too big, wearing your cap under it is a good way to make it fit better though.
You can, under some circumstances, get a ticket for notwearing a helmet - but I can't think of a situation where you would get a ticket for wearing it.