I am unsure of what "Work Casual" is exactly.  Or to be put a better way, what other people 
interpret it to be.
For me work casual is smart jeans and a shirt/
cashmere sweater/smock style top.  I tend to dress my 
style of of work casual on a Monday (usually a quiet day for me) or a day where I am hoovering the skirting boards and hard to reach places.  The rest of the time I dress in the styles that I currently have on sale in my shop.
I have found that since I have been working for myself I take a lot more care over my look each day.  I plan my weeks wardrobe on a Sunday evening (where possible, I do not turn down social invites to do this) and I try to have things washed and ironed in advance.
I like to keep on top of my hair cuts and make sure that my hair is always clean and styled.
I wear make-up everyday now.  Before I used to moisturise and go.  But now I make sure that my 
lip gloss or 
eyeshadow is a shade that matches my dress or my top.  I even carry a small collection of make-up essentials with me in my handbag to touch up throughout the day.
Work casual is now an outfit that I wear very rarely to work.  I feel that it does not show myself and my business off in the best way.
I have been thinking about where this change has came from and it came to me quite quickly.
I am the only employee in my shop.  I do not have a big advertising campaign.  Therefore, I am the face of my brand!  So, if I 
don't make the effort who will?