Magnus obviously wears different sparkling man thongs for each day of the week and all rainbow-colored,of course.Alec...I don't know.I always picture cotton briefs as children's underwear and boxers as teenagers'.Alec acts like a grown up sometimes,but he's still his parents' little boy and that's why I can't decide which one he wears...
I googled 'briefs' 'cause I didn't know what it means,since english is not my first language,and I found this:

I thought it was a warning for those perv dogs under the dinner table,but then I read what was writen there and...I prefer to think of the raivy dog

(yes,this is on porpuse)
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Hey,Jace,I'm an only child!Would you be my brother?
Chitty Chitty Bang Bang is such a funny thing to say haha