I almost always wear black pants with whatever tops I choose (tough in the warm southern California summers, but easy the rest of the year)- jacket with cami for all-breed shows and either a patterned or more casual jacket/vest and long-sleeved v-neck solid colored shirt for specialties (usually). I need some different pants, though...especially with puppies, you'll find that all of that yellow hair and drool or paw marks from jumping on you will show up like chalk all over your *once clean* black pants.
We have a couple of well-respected breeder judges in our local lab club who have mentioned several times to us at meetings or seminars/practice shows/handling classes that you should try to make it a point to dress up enough to show some respect for the judge...that doesn't always mean wearing a fancy pants-suit, but should at least be better than a tee-shirt and shorts.
Good thought about the skirt, Peggy. I may have to do some shopping!
Oh, and you can always accessorize accordingly...we have a couple of people who have looked fantastic wearing cute hats in the ring or scarves (nothing too fancy), and it is always fun to wear lab-related pins/earrings/pendants. At the San Joaquin Specialty a month or two ago, we were given pins along with placements...they are gorgeous (handpainted by Judy Heim of Hyspire fame) and should be fun to wear at some of the upcoming shows.
A word of advice from someone who has wiped out several times now slipping on the morning dew-covered grass at specialty shows....WEAR SHOES WITH GOOD TRACTION!!! There is nothing more embarrassing than a) landing on your butt in front of the judge with your dog jumping all over you thinking you're playing and then b) seeing your newly-formed butt-print in the ring for the rest of the day permanently imprinted in the grass.
Just my thoughts...