It's never been a question of riding in work clothes for me, weather and road conditions never permit. But I did resist cycling specific stuff until I started doing some longer rides at which point it was easier to stick w/ that than to wear other non-work but mud-OK type clothing. Actually my work also involves mud but the mud-OK work clothing is way too heavy to ride in. I do still avoid cycling jerseys although I have a couple just 'cause I like the pattern if not the function.