I wear the kit appropriate to the task.
Blues, I sit at a desk. CS95 I get all muddy; my PA does not allow me to sit at my desk. No 1s, I stand around all day looking sort of decorative, I cannot sit at my desk (if your my age you will know why).
If I am going to get mucky and dirty, but not muddy or wet, then I will wear a flying suit. Much the best coverall around.
When I wear CS95 I feel like a h**p of sh*t. I would rather not look like one too.