After you get a haircut you like, ask your stylist to describe what ey did/what the style is, ideally in the vocabulary of the trade. For instance, my current style includes a face frame, long layers, and some other style words.
Write it down, stick the note in your wallet, forget about it until the next haircut. You get the benefit of repeating instructions as they would be described from one hairstylist to another and are less likely to fall victim to terrible cuts or the poor memory of your regular stylist.
As someone who is less productive with a bad haircut (I have to pin unruly lengths out of my eyes, etc), this has saved me time and confusion.
I’m afraid my point was a victim of the 140 character limit. I don’t think I was quite looking for the availability heuristic (which I’d already checked and discarded), but ended up tweaking my example to use it in the blog.