A pink skirt is one of several skirts available to free players. It is used in the quest Prince Ali Rescue as part of the disguise Prince Ali wears in order to impersonate Lady Keli and escape from prison. The Rowdy Dwarf may ask for this item in the quest Forgettable Tale in return for a Kelda seed.
Pink skirt, Old School RuneScape Wiki
Thessalia's Fine Clothes. - OSRS Wiki
Where to Get a Pink Skirt in OSRS
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PinkSkirt (u/17_Cooking) - Reddit
Fremennik pink cloak, Old School RuneScape Wiki
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Pink skirt, Old School RuneScape Wiki