I do not own Harry Potter, the Wizarding World, or any canon characters.
Harry always thought Dumbledore had an alright fashion sense, everyone questioned him why. Turns out he's colorblind and sees the robes as a series of greys.
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"I honestly don't see what the problem is," Harry Potter said, munching on his sandwich. "Looks fine to me."
Hermione Granger smiled incredulously at him. "Really? You see nothing wrong with," she gestured at Albus Dumbledore sitting at the head table, "his robes?"
Harry shrugged. "Not really. I like the pattern."
Hermione shook her head. "The pattern is okay I suppose, but the colors make it garish. Bright pink and lime-green." She shuddered. "It makes my eyes hurt."
"Huh, doesn't to me," Harry said. "Is that what lime-green looks like?"
She paused. "I mean, I think that's the name for it, maybe more of a neon green instead of lime."
"That's good to know," Harry said. He went back to chewing his sandwich.
"Harry, what colors do you see?" she asked slowly.
He gulped. "Oh, uh, like you said, bright pink and lime-green."
"Then why did you ask me if that was what lime-green looked like?"
"I uh, say want to review the Potions test? I don't know if I got the Deflecting Concoction right."
She crossed her arms. "Now I know you're being evasive. You never want to discuss tests afterwards with me." She looked him directly in the eye. "What colors do you see Harry?"
He looked nervous. "I see a very lovely shade of...gray."
"...Shade of gray."
"Yes, a very nice light gray and...more light gray that's a little lighter. Not white, but pale gray. Not off-white neither."
She felt terrible. "Harry, how do you know who's in Gryffindor?"
"The Lion on their emblem," he said readily.
"And Slytherin?"
"The Snake of course." He looked offended. "I'm not thick, Hermione."
She started to tear up a little. "No, I'm sorry, you're not but I'm beginning to think I am. Harry, are you colorblind?"
He looked away. "No I don't think so. I just, don't really see colors save for grays and whites and blacks."
"That's colorblindness Harry!" She just managed to stop from shrieking, seeing how embarrassed her friend looked. "How have you been coping all this time?"
"One of the few books I got as a kid from the Dursleys was a book of colors. I just memorized the names and the shade."
She felt distinctly terrible. "You memorized them?"
He nodded. "Worked alright so far."
"Is that why you have so much trouble with Potions?" she asked in a dreadful whisper.
"Yeah, kind of hard to tell shades of color with the haze and smoke and everything." He shrugged. "I get by though, especially with your help."
"Is that why you never mind what clothes you're wearing?"
He nodded. "I pick patterns I like when I can, not that I had much choice with the Dursleys, but pretty much yeah." He put his sandwich down, his face twisted as Hermione started to cry. "This is why I didn't mention it before. I didn't want you to feel bad."
She shook her head. "I just wish I knew. I wish I could help."
"It'd be too much to have you tell me every color," he said with a smile. "You do too much for me as it is."
Hermione suddenly looked thoughtful. "Not enough really, and I'm not done yet.
A few days later she took Harry outside and without warning pulled his glasses from his face.
"Hey! Hermione, I need those!" he protested.
She murmured a tricky incantation and moved her wand around the glasses, finally tapping them in a distinct pattern. They glowed slightly before turning back to normal. She then gently slipped them back on his face.
Harry's jaw dropped open. He blinked hard, resisting the urge to wipe his eyes or rub them in case the magic went away. "Is...is this...how you see things?"
She nodded, relieved that the spell had worked. "Yes. I heard of a Muggle experiment with glasses that helps people see color. So I did some research and managed to combine a color assigning charm with a true-sight charm. I wasn't sure it would work, but..." she blushed at how enraptured Harry looked, "I'm glad it did."
"I can see colors," he whispered like a man waking from a dream. "Oh sweet magic, I've been missing all of this?" He looked at her flushed face and his smile was the widest Hermione had ever seen. "Is that what it means to blush?!"
She blushed harder. "Yes. Now you see me like others do. Pasty skin and drab brown hair."
"I think it looks beautiful," Harry said sincerely. "It's a beautiful shade of brown."
She frowned. "No it isn't and you can't say otherwise, you've only just started to color properly."
"I knew what brown was, like I said I memorized the shade of gray," he argued back. He looked all around. "I see all kinds of brown things now, like wood and trees and the ground and everything. Your hair is beautiful Hermione."
If I blush any harder I'm going to faint. she thought. "Th-Thank you," she stammered instead.
"No, thank you," he said emphatically and hugged her tightly.
I'm definitely going to faint. "Is-is there anywhere you want to go and look at?" she asked.
"I rather sit here and look all around with you," Harry said. His eyes moved about almost wildly.
"I'd like that," she said shyly. "In an hour or so the sun will set. That's really pretty."
They found a large rock to sit on by the lake's edge and throughout dusk, Harry's eyes never left the sky. He held her hand the whole time. When the sun finally sunk behind the horizon, he finally spoke. "I don't know how to repay you for this Hermione," he said softly.
"You don't have to silly," she said, equal parts pleased and embarrassed. She hesitated. "I wouldn't mind seeing more sunsets with you, and sunrises though."
He smiled. "I can't wait to share more moments with you, of finally seeing."
"That'll be lovely," she agreed, glad the night hid her brilliantly red face.