Clothing designed to be worn for swimming or with swimsuits.(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 "swimwear" in a sentence
"This swimwear is a full body swimsuit, minus the head covering."
"Only swimwear is allowed, so leave your modest T-shirt in your locker or you'll be leaving it at the entrances to the attractions."
"The party was packed with thirty or forty folks in swimwear (and later on, altogether without it -- or any other wear -- in the pool); and up in the garage the grub and fun did flow."