Honestly for overachiever first dancers I highly recommend finding a practice wedding dress at a Goodwill or similar secondhand shop if able.
We have been attending ballroom classes for our fist dance in December and last week we found a dress very similar in cut and shape to the one picked for the actual wedding for about $60 and just used it for after lesson practice today. The learning curve for dancing with a huge skirt is pretty steep and building up that endurance to dance in a heavy and boned bodice without gasping for breath will probably be really handy in a few months 🤣.