The only way to possibly have received a party hat is if you played Runescape during the time when party hats could be obtained from Christmas crackers, or if you have 300 million gold pieces to buy one. When party hats were first introduced, they were worth very little—around 18 gold pieces. However, now many players who originally obtained party hats have quit the game, thus making them a limited supply. This scarcity has caused the price of party hats to rise, and they will likely continue to increase in value in the near future.
The crafting glitch to get a free party hat: This does not exist. You might see a YouTube video showing a player crafting a party hat using a blue dye, a needle, and cloth. However, this video has been tampered with, and the cheat doesn't actually work. They also claim that you need a specific crafting level to make the hat, but why would Jagex create such an obvious exploit? They wouldn’t, so don’t waste your time trying to use this fake method.
Have you heard about the crafting glitch that supposedly allows you to automatically receive a free blue party hat? Read about it here. How this can be to your advantage: well, because the supply of party hats is rapidly decreasing, it would be wise to purchase one soon so you can save it, and possibly end up owning the last one in the game! Of course, party hats are expensive, so don’t feel bad if you can’t afford one.