Toward the end of the 20th century, the keyhole button closure became popular on dresses and blouses made of nylon or silk, popular fabrics at the time. These garments, which had a roomy fit, were made to be slipped over, but the keyhole served simply as a fastener for the neck. Such clothes, mostly a part of a career line, were considered to be of high practicality. They could be worn interchangeably as casual clothes, and were easy to dress in, since they only required the fastening of a single button in a place that was easy to reach. This, combined with their T-shirt-like comfort and low cost, made them a popular choice for working women for a few decades. Since the 2000s, keyhole blouses have been replaced with sweater and T-shirt-like blouses that are elastic and are simply pulled over with no closures.