Polo Shirts: How many buttons should be buttoned?

Depends of the polo. Usually I like to button them up, but it's up to you.

No rules, but my boyfriend always does 1 or 2

There is no rules.

There are no rules.

Generally all of them

not mention

There are no rules, just go for it.

For a grill-out with your buds, the standard rule of thumb is two to three buttons undone from the collar. But you also get more leeway for the lower buttons at the hem.

all 3

I don't think there are any rules.