When you have rep with Netherwing and you go to Netherwing Ledge, it changes you into the orc disguise, well i was bored and went into my murloc costume, and after i went out of it, i went into my normal form, but still had the buff of the disguise, so the netherwing people wouldnt attack me
Basicly its very simple
1) Go into a Costume with the buff of the disguise
2) Go out of the costume
Wallah no Disguise but still have the buff
No need for Rep, just felt like pointing that out
*Note* This doesnt have to be the murloc costume, can be the Deviat Fish that makes you a pirate or ninja, just need to change forms and go back