fly on Vietjet with flight attendants wearing a bikini
That said, South East Asia isn’t as yet suffocating in political correctness when it comes to sexism, so it’s actually quite common.
For example, Nok Air in Thailand do a nice calendar each year.

Apparently, this incident made a lasting impression. In 2017, VietJet announced its maiden flight to Jakarta and Indonesia reportedly became nervous.
Indonesian ambassador to Vietnam Ibnu Hadi gave assurance that "the bikini stunt was only for one event" and that flight attendants will be properly attired for all Indonesia flights.
Edit: My answer was collapsed "for violating Quora policies" and I don't know which policies I violated so I deleted the information on the 2018 calendar to keep my answer focused on the question.
Bikini-clad dancing ladies once performed mid-flight on a flight to Singapore (see video on VietJet's YouTube channel) and models wearing costumes on a flight coming back from China joined the Vietnamese football team (below).
Ladies hired for these PR stunts are models, not flight attendants.
Budget airline Vietjet sparks outrage for hiring bikini-clad flight attendants to join football team on plane
Meanwhile, here's a photo of VietJet flight attendants:

And, not particularly sexy but still noteworthy would be this safety demonstration video by Bangkok Air (which is a great airline by the way) which starts and ends with a corny little dance of both female and male FA’s. I’d say this is functional to get people’s attention, as opposed to passengers snubbing the safety vid.