possible ghost Experience

Hello!
I wanted to share an experience I had when I was a kid.
When I was about 7/8 I'm not too sure which but when I was rather young I was stood by my mum who was washing the dishes. Our kitchen window looks out onto the garden so you can see the whole garden from the window. I was just looking out to the garden when all of a sudden I saw this man, he was paper white and had dark black clothing on. I could see him but my mum couldn't otherwise she would have said something. I look away for a second out of fright and look back and the man had disappeared. I never saw him again but it was an odd experience to say the least.