Question

A person wearing a blue shirt is standing in sunlight. What color(s) of light does the shirt reflect? What color(s) or light does the shirt absorb?

Answer 1

The shirt reflects most of the blue light that hits it, and
absorbs most of the light of all other colors. 

That's a big part of the reason why, when you look at it,
you say "Oh ! Oh ! Look at that !  That shirt looks blue !",
and why the shirt quickly gets a reputation as a "blue" one.

Answer 2

Im just a beginner but i know that the darker the the shirt is,the more sunlight it will absorb