The phrase "perfect shade" means the exact or ideal color or tone that fits well for a specific purpose, like matching a paint color to a room or finding the right color of makeup for your skin. Full definition
I've seen so many people wearing pink coats in the blogosphere but this one is the best, it's the most perfect shade of pink & I really like the gold hardware. (songofstyle.com)
It's smooth and the absolute perfect shade for my complexion! (maybelline.com)
And that is really the most perfect shade of red ever. (thesequinist.com)