Top to bottom so I don't misalign the holes. At the bottom it's too easy to mistake the second one up for the bottom hole.

Chaotic neutral option: I start mid-chest and go every other (or every third) down, then come back up (except when I go back to where I started and go up, then back down).

This gives me some extra speed at determining if I am feeling good about that shirt that day before fully committing to all the buttons. And rare misalignment is more easily corrected.

I was today years old when I learned bottom to top was an option. I would 100% misbutton the shirt so badly, if I did it that way, that it would take a world-renown topologist to resolve, probably earning them a Nobel Prize.

Top to bottom. Very easy to know you're starting with the button just below the "choke point". Then you won't miss a button on the way down.

On the rare occasion I wear a shirt, it's top to bottom for me, because I feel I'm in control of what goes on with my collar.

However with cardigans I go bottom to top because I can't trust myself to not miss a button. I typically don't miss a button on a shirt because I pull on the fabric to make it look neater, whereas a cardigan is a more relaxed fit so it's easier to skip a buttonhole.

Top to bottom.

Start with the third button from the top and work down.

You are less likely to miss a button that way.

I read an article on funny differences awhile back Women tend to button top down. Men tend to button bottom up.

Women tend to face away from the shower water. Men tend to face into it.

Women tend to hold a stabbing knife with the blade towards the pinkie. Men tend to hold a stabbing knife with the blade towards the thumb.

I've switched to the boy way of knife holding.

Bottom to top, no idea why