I had my colors *done* decades ago. I ended up with 28 cards, each with four to ten swatches of fabric on them, 209 swatches in all. Most cards contain eight swatches. I was told that as I got older and greyer, the hue would change (go lighter), but not my general colors. If I were to have this done today, the colors would be slightly different simply because the available colors in fabric swatches have changed.
My husband's coloring is significantly different from mine, and I couldn't figure out what would look good on him, so I made him have his colors done at the same place. He ended up with 19 cards, each with four to nine swatches on them for a total of 131 swatches.
My coloring is slightly warmer than neutral and his is very warm so I think that is why I can wear a greater range of colors. I didn't get my colors done so much to learn the colors that look really good on me but to figure out which neutrals I can wear, especially which beiges. In addition to beige, I learned that a lot of colors like deep teal, forest green, and cranberry function as neutrals on me: I can wear them, but a solid outfit in that color does not provide enough energy.
Supposedly, wearing one's eye colors (and remember that our eyes have several colors, even if only flecks!) is calming, and wearing red (which includes pinks, corals, and deep oranges) is supposed to excite others sexually.