They're known as "the cat dresses", Agnetha's & Frida's skimpy 1975 outfits. I think that the word dress is some sort of "overstatement", t-shirt would be more appropriate!
...and the world is your gynaecologist...
Apart from the well known hits , the legs of Agnetha and Anni-Frid were the most exciting part of ABBA's show.
