Mood Sweaters Should be a Thing

Why aren't there mood sweaters?  Like a traditional knit sweater that changes color based on your mood or temperature?  That would be cool right?   So I got to thinking more and I thought of Hypercolor back in the day, but they only had tees and hoodies. A quick search brought me to: How about no.  Not at all what I'm thinking.  In a world of anything is poss…