I doubt the good Lord is concerned about what we wear to church; He is just glad to welcome us to worship.
However, back in the 1950s and 1960s when I was growing up, most wore their very best clothes to church. Everyone looked so nice. Women wore their finest dresses or suits. Many wore hats, some wore matching shoes and gloves. Men often wore hats, too, and suits with white shirts and ties.
I had Sunday clothes that could only be worn to Sunday school, church or a wedding. I don’t ever remember anyone wearing T-shirts, tennis shoes or blue jeans to church or Sunday school back then; not even if they were new. Everyone dressed up for weddings and funerals, too. Maybe it was a form of respect.
Saturday nights were busy. Mother checked our Sunday school work, shoes were polished, a bath was a must, and hair was shampooed.