the black skirt/black hose is a bit outdated nowadays. if you need to wear pantyhose, go for the skin toned kinds. if you're in warmer climate and do not need a hose, by all means, you don't have to wear one.
you can do some shopping when you arrive...it's part of your budget...
I saw some cute ones at Wal mart last week. They had knee high and long ones, without the slits. They were olive, denim and beige. And of course, they were modest prices.