Heirloom

So i got few horde char's and i made one on ally's side , never leveled up there , so i wanna get heirloom items to make it go faster.
I wanna know , can i buy those items on my horde char and transfer them to my ally char?

And if i can , can anyone tell me how to do it?

i appreciate the help. :D

The Heirlooms are account bound and as such you can send via the ingame mail to your different faction characters.