Fun! Your mom was talented! My mom always made my costumes. One year I was Princess Leia from Star Wars. Another year I was a princess. We glittered up my sneakers to they would be more "princessy".
Oh my goodness! You have brought me many memories. I have photos of costumes from the 70s that look a lot like this! Only I was the Mom who did the sewing! I really love it that you are preserving this memory!