To save time and resources just pick a number(s) if you are someone who does not make the effort to dress well when attending the Mass:
1.) Jesus does not care what we wear.
2.) I don’t have enough money to dress well.
3.) Suits/jackets/ties/skirts/pantyhose, etc. etc. etc. are too uncomfortable.
4.) If I dressed well, I would feel out of place in my parish.
5.) I don’t want to get into competition with others at my parish in terms of style.
6.) I have to work right before Mass and there is no means for me to change.
7.) I’m going to the beach/lake/park/golf course after Mass and there is no time to change.
8.) If I dressed formally for Mass during the summer I’m sure I woud have a heat stroke.
9.) Only pompous people dress-up for Mass.
10.) What? I wouldn’t want someone to think I was Protestant!