The General Freebie Requests thread would not be the place for a commercial offer.
dkutzera, are you wanting a new figure or a new character for an existing figure? The former would be expensive, especially if you wanted exclusive rights.
I am considering hiring someone to make me some exclusive right clothing for K4. What is the best place on the forum to post about this to get some price ideas and/or find an designer?
The Commons gets the most traffic. Howeve make sure you explain exactly what you require, and if you are looking for actual clothing models or just styles for an existing model. Also don’t be surprised at the variations in any answers you may get, especially if you want “exclusive”