Red Shirt
Red-shirts in anime? They jump right out. Bright colors contrast with dull outfits, making characters memorable. Inuyasha's fire-rat robes are a deep red that matches his half-demon side and declares power. One-Punch Man's Metal Bat wears a delinquent uniform over his clothes, fitting his hot-headed brawler style. In Slime, Lupin III's jacket and Benimaru's coat are red, which can symbolize energy, danger, or coolness. Most of it is casual clothing with anime touches like light-catching folds or store-like logos.
Visually, heroes are bright red and edgier types darker red. Rolling up your sleeves prepares your arms. Relaxed or buttoned collars. Fanart shows fabric shine and movement wrinkles. You can wear it with jeans for street style or armor for fantasy. He looked primitive but bold in Dr. Stone's robes Tsukasa made. Luffy-themed red shirts are popular with One Piece fans. They glow warmly on cool backgrounds, making them ideal wallpaper.
In a good way, red shirts evoke the Star Trek curse for otakus. Cosplayers love them for they make bold statements easy. Series heroes charge in fearlessly. In shonen fights or slice-of-life shows. Are you buying one for your setup? It is engaging without being loud. A great blend of epic and mundane.