ok, easy, just get trusted then when your on a really hard raid (ex Zul'Amen or Illidan) when he drops the stuff just need it all.
second option
when you join your guild and have been trusted ask your same calss to wear his tier armor then just get more stuff, keep it and say
" yea just saying i cant raid on anyday that ends in day so, gotta go!
/gquit"
and bam!