The only way to get people to wear masks out in public / stores is for the stores to mandate it for entry. Without that mandate, half the people are going to go without masks (at least from what I've seen the last week or so).
Agreed, although people seem to be getting better about it. Slowly.
We went to Harolds yesterday - a plant shop in the Marginy (an outdoor shop) and every single person had a mask on. I know it's the Marigny, so masks are probably already stylish, but it was outside. I was impressed.