if sunlight were yellow instead of white the most comfortable color to wear on a hot day would be

will be yellow, yes yellow, yellow and green are forbidden colors to each other, ones they are illuminated on each other, their frequency cancels out and they disappear, by disappearing, meaning they object will have no light and this correspond to darkness ( absent of light),  the objects turn black 

  with sunlight object means the yellow cloth will be cold and so the body.