Step 1: Ready Steady INVISIBLE!!
Okay now you might not believe me but black clothes are bad for stealth. Unless it is pitch black but than you won't be able to see so WHAT ARE YOU DOING? Try to get dark colors like on a woodland area try dark green. Or I'd personally would get dark clothes of any kind if I was trying to scare my da or sister. Than cover you gave in something. BUT not your whole face cause you be able to see but of you get dirt/ash/grime and cover splotches over your face it will break up your outline and people won't be able to see a oval shape.