Obtain a crate of Paineel uniforms from the Fell Blade. You should probably do this without being noticed.
The crate is at ( 1854, -298, 3448 ) /waypoint 1854, -298, 3448 in Paineel. You do not need to hide or be invisible to get the crate. The Erudite standing next to you will not notice if you grab the crate even if standing right in front of her doing it. The crate disappears but quickly repops.