:>>"I need shoes to go with my new (245, 197, 236) skirt" ;)
Yet you'd need add to this the ambient light and the sky color. I mean, all the lighs that come from the ambient and from the windows. The rgb result of your shoes would be the reflection of all this, and what is worst, added to idiosyncrasy of your own eyes and brains.
A hard task even to Isaac Newton, who, as you know, begun all this.