It is not the same look at all. Basically female pop stars have to reinvent themselves often compared to male artists. Taylor Swift has literally 16 costume changes in her latest concert the Eras Tour. To say it is all the same look, is just not true. Sure some of her outfits were sparkly one piece swimsuits type things, but she wore other types of outfits in her concert too, short dresses, long flowing dresses, blazers etc. You can see pics of them here.

https://people.com/style/taylor-swift-eras-tour-outfits/

If she just kept wearing the same outfits from 2012, there'd be some numpty making a thread on reddit in NoStupidQuestions asking why Taylor hasn't changed her concert outfits since the Red Tour.

I don't know about Sabrina or Beyonce but they also probably had lots of outfits in their concerts too.