One that makes or supplies costumes, as for plays or masquerades.(noun)
A clothes tree.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "costumer" in a sentence
"- If the costumer is not right, read rule number 1."
"So I called their costumer service number and got a lady in India."
"Kelldar, who I have dubbed costumer extraordinaire, is a seamstress and a frequent cosplayer."