You can look up sheilding and cloaking spells. I have here one of my original spells for this occation.
Items needed: White or grey candles, intent, visualization, and willpower.
FIRST: Light the candle, then carve into the candle whom you was to cloak yourself from and say:
" You cant see me, Nor I You.
I banish you from my sight, away with you.
On this night I cast this spell, harm to none. This is my will, let it be done."
Then leave the candles by the window to burn down itself.
Note: Just like every other spell, this spell will take time, but if you understand the way magick works, then I can see no reason this spell wont work.