Dress sense of people

How do people decide what to wear on a day? Here I am concentrating only on the dress sense of folks coming to office as it is the environment most familiar to me now. Usually I decide on the morning of each day and then iron my dress. But there are some people who stick to a routine. For instance, I know a certain PM in my office who wears only a particular color on a day. And so far he has never broken his habit.

These kinds of behaviour fascinate me and once I did a small research on it. It was nothing much. I used to observe a female colleague (at least, make my research interesting. Hence my reason for not using a guy as my subject ;) ). After a few months (yes, I tenaciously collected data!) I had the list of all the dresses she would wear to office. And I was able to predict what dress she would wear on a day with an accuracy of around 75%. This led me to the conclusion that people don't select their dresses in a completely random manner. Of course, there are several factors that come into play here, forcing them into a routine. Even then there are lots of different decisions they can take on a given day. Still somewhere in the back of their minds, something prompts them to select a particular dress.

My next research was finding what that was. But, alas, I could not continue it. Too much other stuff came up my way. But I may resume it someday. Do I sound cranky?