How come most people don't make an effort to dress neatly when in public anymore?

In the 1950s and early 1960s, most people who went out in public, even for ordinary tasks like shopping or going to a movie, used to make an effort to dress well and neatly, groom themselves properly, so as to maintain a degree of respectability. Most men were clean-shaven and groomed, most women were dressed nicely and had their hair done, and even most children were well-groomed with neat haircuts and clean clothes. Nowadays, all you see are people in sweats or dirty ripped jeans, with uncut messy hair and baseball caps, and an overall ungroomed appearance. What happened to basic grooming habits and self-dignity? Don’t blame it on the economy——even back then people were not rich yet still strived to look “respectable” in public. I don’t mean dressing up with expensive clothes, just dressing well and neatly.