Question

Why did you choose such a common costume? antonym for common

Answer 1

Rare, unique, uncommon, extraordinary..

Answer 2

The definition of common is:

1.  belonging equally to , or shared alike by, two or more or all things being questioned

Antonyms Include the following:

Abnormal
Different
Exceptional
Infrequent
Irregular
Peculiar
Rare
Uncommon
Unconventional
Unfamiliar
Unorthodox
Unusual