The author reads (or maybe doesn't know enough about clothes/fit) too much into the engineers choices: you can normally tell by awful fit of the clothes on people who just aren't that into fashion and don't need to be outwardly presentable. It's not that difficult and hardly a general rule, but anecdotally if the clothes don't fit that well then likely an engineer.

To the author: read a few fashion blogs (hell even complex) and compare to your photos, those who had to be presentable were in clothes that fitted nicely.