While I have no better clothing tastes than music tastes (meaning you'll find I can have very good tastes, but it's just because I like so much stuff that there just has to be something we agree on) I must say this, I'm pretty sure not for the first time here:
Get some Vans Slip-on Lites.
They're not (necessarily) shouty about their brand, they can look subtle to pretty classy, depending on what you go for and of course what else you're wearing, and they don't cost a whole lot (of course, prices fluctuate wildly, so I'm not gonna bother trying to give you an exact figure).
But the real thing is, they are literally socially acceptable slippers.
It takes literally three seconds to wear the pair, they're no heavier than a slipper, and they're the most comfortable shoe I have ever used. Even for long walks, my legs will hurt before my feet will.
For everyday use, running errands, or even just throwing out the trash, because they'll literally be the quickest thing to put on, I cannot recommend them enough.
Below examples of subtle pairs.
Of course, that's not what I bought. I bought the pair below. Which work surprisingly well with an otherwise plain outfit.