Damn so I forget that most people are not familiar with more than one measurement system in their daily lives (at least in the US; we may recognize that the metric system is better, but that doesn't make us any less attached to our imperial units), and it turns out that most of my friends think that a centimeter is like, a millimeter, and not like, a little more than a third of an inch. Like 4 inches is about 10 centimeters. They're not as itty bitty teeny weeny as you think guys. Your hat making you taller by "only about two centimeters!" would mean that it is making you almost an inch taller, which is a significant boost when you are 5'1" and trying to make the argument that you are actually 5'3".
To be fair, I only know this because I like to use imperial and metric units in all of my character reference sheets to communicate height and weight because I have definitely seen non-Americans express confusion over the imperial system before, and I want my measurements to be easily readable by people outside of my country since the internet is and should always be an international space. It's not like I'm superior or anything, I just happen to hold a certain viewpoint that has led me to develop a very obscure skill that I do not need in my daily life almost ever, because I still do not understand kilometers or degrees in celsius.
Also I am very much coming around to centimeters as a preferable method for measuring height because they are just far more precise than inches and feet, and they don't group up weirdly, either. Like, feet are starting to remind me of stones, which have to be the most confusing way of measuring weight that I have ever been witness to. What do you mean "it's 14 pounds??" Why would you measure weight in UNITS OF 14???? Do you have 14 fingers? 14 toes? 6.35 kilograms is even worse. Switching to the metric system just made stones even more ridiculous. At least us burger people aren't responsible for perpetrating that one.
