Let's ignore canon for a moment (sorry i meant an eternity) and pretend Steve's mom is a beige mom that heard that minimalism and beige is so in style. So she never let him have things with color because "it's not fitting with the times, Steven."
Hr grows up, starts wearing his colored sweaters instead of his neutral colored polos, or maybe even bright and colored polos. He doesn't know what goes together or what colors look nice bc he never had access to lively things like that (that and he's my favorite dork who I think would mix and match horrible prints). Then Eddie comes along, all black and dark in colors, takes one look at Steve trying and goes "oh yeah, we're doing this." So he takes Steve shopping, and makes him change over and over again into colors that both look good and Steve likes. Eddie gives him gifts of colors and assorted items all for the purpose of seeing Steve light up in joy. Slowly that lonely room of his is vibrant and bursting with color and it hurts Eddie's eyes but Steve's smile is worth it.
















