@j This is what my Grandpa wore all of his life. They're excellent workwear, but:

1) They don't pair well with anything at all except a pair of work boots and a t-shirt. They are undeniably out of fashion.

2) They tend to accentuate the worst parts of your body if you're fat, and they look loose if you're thin. They never fit right.

3) They're very much associated with very old age.

You should have a pair or two, but you shouldn't wear them out into town.