Supergirl has had many costume changes over the years, and she got particularly inventive during her run in
Adventure Comics. I believe at least some of the styles she wore in that era were from fan suggestions. The outfit she is sporting in the above cover has always been my personal favorite.
This marks the seventh cover featuring The Danvers Twins:
They battled The Gladiatrix in
issue #1872...
They faced a stone centurion in Issue
#1808...
They had robot problems in
Issue #1414
They were at odds with one another in
Issue #763...
They played a trick on the world in
Issue #520...
...and they were first revealed to be sisters way back in
Issue #152
By the way, later today I will be taping a video interview with Mr. Media himself, Bob Andelman. In it I will go in depth into the creation of this cover to give an idea of the process. I'll be sure to share the YouTube link once it becomes available.