Answer: Lin-Manuel Miranda
Explanation: he is an American composer and lyricist, who is extensively known for writing the music and lyrics for the hit Broadway and West End musicals ‘In the Heights’ and ‘Hamilton’. He is also known for co-composing ‘Bring It On: The Musical’ with musician Tom Kitt, as well as creating the fourteen-minute mini-musical ’21 Chump Street’.
It depends on what you are talking about when you say "create the look".
Most likely, the answer you are looking for is the Director, because the Director will give input to the costume designer on the character's look and how it fits into the overall design elements of the entire production.
If, on the other hand, the question is asking about who assists in building the costumes, then the answer is the Wardrobe assistant.
Again, it all boils down to if "create" means design or construction. In context, my best guess is it's referring to design, in which case the answer is the Director.
Because some dye might not stick to the materials or work on the materials of the cloths or if you have a budget of $10 and cant go over but you spend $9 on sloths and the dye cost $2.50 then you would of gone over budget.
