To keep your hair from showing through wigs, wear a wig cap of appropriate color. They come in pink, green, blue, beige, black and white. You could make your own wig cap from an old pair of tights. The wig cap does a few good things: it prevents the wig from itching too much, hides your real hair color, keeps your real hair under the wig, and helps keep wig from sliding off your head. After you've put the wig cap on and the wig in place, put in TONS of bobby pins to force everything to stay put.
I used to like wearing wigs, however I've recently discovered that if I wear a wig for more than 2 hours my eyes get all red and itchy from some sort of allergic reaction. :oops: So I have to limit my wig time as the eye irritation blurs my vision and doesn't go away even after I put in eye drops. :cry: