I used to use different bankers.
This one will have all my cloth, that one all my leather.
And then wowhead with the banker, to see what the crafter needed.

However, resources almost always sell for more than crafted goods, at least on my server.
So my new approach for the last couple of years is to send the mats to my AH toon.
Who then lists it.
If I want something, she can almost always buy it (or advertise in trade - buying) for less than the mats.
So just purchase and mail.

Stupid that the economy works that way.
But makes it much easier to acquire gear.