Depends on how pale you are.
If you are ghostly, as I am after an extended Chicago winter, then yes, I can get a good amount of Vit D from walking around with my head mounted solar panel (shaved head) exposed and sleeves rolled up.
As I get browner, I need more exposure. Need to get the shirt off or more time in the sun.
It also depends on latitude and precursors. The D that you get from veg is D2 that needs solar activation. The D that you get from animals, can be ready to roll or need solar activation, depending on how much sun the animal it came from got. Let’s have the grass fed fight again… or rather, let’s not and say we did. As to latitude, as I mentioned, here in Chicago, when old Mama Earth tilts North America to the sun, it’s good. When she turns it away (winter), I’d need to be into cold exposure for extended periods.
There’s a whole section on this in Protein Power Life Plan, that advises on exposure needs based on skin tint and latitude.