Mainline Delta excluded, it's about the same across the board between the appearance of regional pilots and mainline. If you argue with this, then you're wanting to believe something that isn't true. I jumpseat and travel on everybody, there are a ton of regional pilots that take the care in their appearance, as well as mainline.
Some of you have stated that one's pay should have no correlation to their appearance. I make less than some rampers... I just got my full uniform dry cleaned... the tab was close to $20. I can't even afford to tip the van driver a dollar. On a typical four day that would be 8 dollars... four four days a month makes it $32. I'm a commuter, back on first year pay after five years in Part 121. I wish I could go online and punch in my credit card number to buy new uniform shirts. Instead, I just wrote a check for 10% of my monthly salary on a crash pad for next month. So, I iron what I can and do what I can to stay fit and in shape. But you're crazy if you're going to comment on my uniform for what I get compensated because I'm trying... and if you don't like it then you're just an awful person. And if you bring that attitude on the flight deck, and you're going to give some guy a hard time because his shirt is wrinkled or he has a little 5 o'clock shadow then YOU're the guy nobody wants to fly with... and if you don't believe me, then that's a testament to just how right that statement is.