you need to have the Banana Town Helpful Citizen Badge by completing the Intro Quest by Major (I don't remember if this is the right quest to get the badge lol but give it a shot lol) then you will receive the quest by the Twins in the clothing store to get 10 5-star wools, done that then y'll get the dyeing book to get the recipes for dyeing. And the 2nd part I think you need to find the Pink rabbit to talk to in the afternoon timegame to get him do the cosplay for the police rabbit. Hope this helps.