A cocktail waitress is a type of server

Waiter

Waiting staff, wait staff, or waitstaff are those who work at a restaurant or a bar attending customers — supplying them with food and drink as requested. Traditionally, a male waiting tables is called a "waiter" and a female a "waitress" with the gender-neutral version being a "server"...

 who specializes in bringing drinks to patrons of bar

Bar (establishment)

A bar is a business establishment that serves alcoholic drinks — beer, wine, liquor, and cocktails — for consumption on the premises.Bars provide stools or chairs that are placed at tables or counters for their patrons. Some bars have entertainment on a stage, such as a live band, comedians, go-go...

s, casino

Casino

In modern English, a casino is a facility which houses and accommodates certain types of gambling activities. Casinos are most commonly built near or combined with hotels, restaurants, retail shopping, cruise ships or other tourist attractions...

s, comedy club

Comedy club

A comedy club is a venue, typically a nightclub, bar, or restaurant where people watch or listen to performances, including stand-up comedians, improvisational comedians, impersonators, magicians, ventriloquists and other comedy acts...

s, live music venues and other drinking establishments and often wears revealing clothing in order to get more tips. Casinos traditionally dress their cocktail waitresses in fancy outfits with very short skirts and pantyhose, while less flashy establishments require waitstaff attire. Often, pantyhose is worn to show off the legs such as the famous Playboy Bunny

Playboy Bunny

A Playboy Bunny is a waitress at the Playboy Club. The Playboy Clubs were originally open from 1960 to 1988. The Club re-opened in one location in The Palms Hotel in Las Vegas in 2006...

. In fact, Playboy Bunnies are also featured as cocktail waitresses. As of today, cocktail waitresses are often seen in Las Vegas.