@jcboy,
I recall the first time I witnessed this phenomenon.
I was travelling to visit Setanta in 2001 or 2002 - I was on the PA Turnpike - one of the highway stops - whole families in their pj's getting out of cars and vans.
Then, in Columbus, people in the stores in their pj bottoms and grotty t-shirts.
I'm glad this 'fashion' has never really made it to Ontario.
I don't expect people to wear formal wear to go shopping, but jeez, clothes would be nice.