It's Takeshi's snap-shot joke of a women's leotard gym costume, which was well known to Japanese old boys through Nadia Elena Comaneci's perfect-score performance in 1976 Montreal Olympic. They might have seen her perfect legs, not her performance.
こんなところで。
A parody suggesting a combination of Gold medalist Nadia Comaneci and the so-called "high-leg" bathing suit fashion which were a fad back in the mid 70s.
瞬間芸の面白さに言葉で対抗しようとしても所詮無理があるので、こういうものは理路整然と説明するのが、かえって面白いのです。ネットで相手と通信しているなら、画像も紹介してあげましょう。
http://www.google.co.jp/search?q=%E3%82%B3%E3%83%9E%E3%83%8D%E3%83%81&rls=com.microsoft:*:IE-SearchBox&ie=UTF-8&oe=UTF-8&sourceid=ie7&rlz=1I7TSHJ
Do you know Nadia Comăneci? (知らなかったら、She is the famous Romanian gymnast who won many gold medals.)
It's the old one of Takeshi's silly jokes, which means her uniform of that time.