“”"Wear the clothes you would wear if you were attending the Crucifixion and Resurrection. Because you are.
When at Mass you are presenting yourself before your Lord and King. Wear the nicest, most modest clothes you own and act with the greatest restraint and dignity.
“We recall that a dress cannot be called decent which is cut deeper than two fingers breadth under the pit of the throat, which does not cover the arms at least to the elbows, and scarcely reaches a bit beyond the knee. Furthermore, dresses of transparent material are improper.”
This was the teaching of Pope Pius XI and it would take some significant gymnastics (coincidentally also banned for Catholic women) to say it isn’t Magesterial.
I like this ChunkMonk. Yes we can wear any other clothes at any other time we want but this is our time in the presence of Our Lord and should be our best and most modest.