You need to help people around the town, but I can't remember which. I managed to do it once but I lost the save file and I can't remember
Well, I think I known how to get one of those. First you have to take off your armor before you meet the brown doggo in the forest ( I forgot his name) , you only need your belt. After that, you have to let his crazy friend hit you to broke the belt and then you just need to defeat him. When you done that cute doggo will give you the special attire. Sr for my bad grammar, English is not my second language.