Bottle Multi Pattern

okay...
this is a MULTI QUESTION!!!
yay!!!

1.JUSTIN BEIBER- I am going to be just beiber for halloween,
my best friend is going to throw water bottles at me.
I got a shirt that says "I (heart) me", with the heart being rainbow... if you get my jist...

I was planning on getting more JB gear but i cant find any on HotTopic.com!
Anything he commonly wears i can find on the website? (i have a gift card)

2.THE SHIRT WAS ON CLEARANCE.
therefore being a large.
I NEED websites, videos, DIY patterns, etc....
that have ideas on how i can make a cutoff tank top. not a females but more male-ish tank top
JUST anything to minimize the large size (Im a fifteen year old girl- medium)

HELP ME PEOPLE!!!
OMG ok i Know he's not gay nothing against gay PEOPLE i am GAY
anyways...
ITS halloween and its an inside joke