you have to do the pirate random event
its the event when u disappear and are asked to do something
if theres another way,idk
thats how i got mine
if u need anything else
add me My name is Nikmajor
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In varrock they let you change your clothes at the hair cuttery.
There is a certain part of the "Recipe For Disaster " quest That allows you to do that, it is the "Pirate Pete" Part of the quest, do that, and it should tell you how.
Varrock for clothes, Lower Falador for gender, Upper for hair.
The best thing to wear in runescape for non-members is usally nothing or something light that offers some protection and for members will be some special event clothes with boots of lightness.
If we listed all the clothes here, it will just spam the page right up, it just best go on Runescape.com then just type it in the knowledge base, and see what it comes up with.