The tailor profession is considered by many to be the hardest profession in the game. If you still want to become a tailor, the first thing you need to do is get your hands on a tailor manual. This can either be completed by running the Blacksmith dungeon, or buying a tailor manual from either Bonta or Brak scroll shop. Either buying the manual or getting a key to Blacksmith dungeon will cost you anywhere from 5-20kk, depending on the server. If this is a lot of Mesos for you to spend, then youre in for a rough ride. Get ready to spend a lot of Maple Story mesos for very little progress. Secondly, youll need a needle and thread that can be found at (2, 2) or (-31,-55) for 100 cheap mesos. Once you have this, you set to go.
Now that youre a tailor, realize that you are in no position to make any only to spend. What you want to do is make Piwi hats and capes over, and over, and over again. This requires:
1 Piwi Feather (any color) and 1 Sesame Seed.
You will make hundreds of Piwi hats and capes that are for the most part worthless. You might be able to sell one here and there, but the most efficient thing to do with them is to crush them in the mage workshops (do shatter an item, not crush resources) and sell the runes. It wont be even close to the Habbo Coins you put in, but its better than nothing. Do this until level 20.