My ex wife never did and I was floored more than once.
My own changes were never sudden, so I never surprised her.
Just asked the wife and she said yes she would tell me if she made major changes!
woo hoo 
As for myself I already know I would check with her/
The way I see it is that she is the one who has to see me! So she should know and approve if major changes are coming.
Well I didn’t warn him that I was cutting myself a fringe but then again, I didn’t really warn myself, I just did it. When I saw him later that day, he didn’t really recognise me at a distance because my hair was up in a ponytail, with a fringe (bangs) and purple.
If I was doing something drastic, like cutting it all off, I’d ask him if he liked the idea, because he’s the one who has to look at me. I didn’t warn him when I got caramel streaks but he noticed anyway and liked them.
No, I wouldn’t check with him.
I can’t imagine what he’d ever do to his appearance but if he did something he’d check or say something to me first.
What kind of appearance changes are we talking about? A new hairstyle or a full-facial tatoo? I wouldn’t bother checking with my husband if I was just getting a different haircut but I’d probably feel I should mention it to him if I was going to, say, shave my head and get dozens of facial piercings. Not that he would try to stop me if that’s what I really wanted, but, you know, it’s kind of courteous to give warning to the person who’s going to have to look at it across the breakfast table every morning.
No and no. I never even notice if my wife changes something. The most I do is that I tend to grow out my beard in the winter and shave it in the summer. The wife rarely says anything about it.
Hmm. I don’t ask, so much, as sort of run the idea by my husband if I’m in the mood for a drastic change (cutting six inches off hair, dying to platinum blonde, etc.) He’s my reality check; I’m an idea person, and not all my ideas are great (or safe) ones. He doesn’t check with me, but he doesn’t change much, either (same hairstyle for, oh, 35 years now?). He grows an occasional beard and has fun with it (goatee, sideburns, biker chops, etc.) but that’s about it.
As a newlywed I checked; he wasn’t interested in that level of detail. And at this point we’re not likely to get tattoos or piercings. Anything more drastic would be discussed (but again, isn’t likely).
Depends on the level. Hairstyle or length, nah. New hair color, no problem. Tats, now we need to talk. Of course, I had already been shaving my head for years when my wife and I first met, so for me changing would involve letting hair grow for a change.