It is a Patterned Hoodie, They are Popular with the Kids

I walk in shoulders up
hands in my hoodie
chin on my chest
eyes on the floor
when I'm sure no-one's looking I scan the room once for
anyone I know
Hooray! I spot a chum, hide my relief
pull one hand out of my hoodie
and lift it, from the elbow
into the air in as nonchalant a gesture as possible
at the same time I bring my chin a few degrees up on the y axis
quickly
when I have completed this manoeuvre I say
hey
or
hey buddy
I like to introduce a variable into the most rigid social structure