In my POV its the mix of modern fashion and less estreme J-pop style.
They still look very modern, better than those from the 80s, 90s, but we can somehow see some similarities of current k-pop style with the oldies, in terms of the pattern of the clothes they wear, how they wear it.... in which, u rarely find those older fashion pattern in current j-pop style.

One type of clothes i noticed which is famous in sunway is the polka dots/no polka dots, no ribbon around the neck and sleve-less, half visible shirt. Back to 20 years ago, plain sleve-less shirt with simple color and polka-dots/no polka-dots was quite famous for girls to attend party. Now this shirt just added with big ribbon and half visible and is quite famous in k-pop style.

Another thing is, the use of accessories in k-pop is also more frequent compare to oldies. Just not as much as extreme j-pop