Bird Dog put this up over at Maggie's, and it's fun.
But let's look at the changes since 1942, almost 80 years ago.
Tap dancing. My 2nd granddaughter takes tap (her older sister takes ballet), but let's face it - it's a curiosity now. No one does this. I learned a bit as a theater major in the early 70s, and I had a roommate who was actually good at it and still used it after college in his career. (I just looked him up to see what he was still doing and that is absolutely going to be the subject of another post.) But even in 1973 it was outdated, passe. Couldn't do this today.
That costume, especially the hat, and secondarily the low inseam, is weird. Necklines, waistlines, and hemlines go up and down for women, but this has never come back, seldom even in direct imitation trying to capture the era. Costumers choose different 1942 hats and pants to do that.
That strong left hand piano/blues intro is in the composition background of a lot of music since then, but pretty much long gone. Also, it is all on a stage, with a curtain, which is only used in very limited contexts now. People put live shows on stage, certainly, but the stage itself is not a focus. In the early ages of movies and even TV, there was still this convention that entertainment takes place on a stage. Using pianos as set props is a Busby Berkeley thing, see below for a more extreme version
One hundred men dancing with a woman (or one hundred women dancing with a man) also never happens. It is sort of a cool thing, that could endure a retro re-use, but it still just isn't done now.