In some images she has a red bow but in Sailor Moon R she is mostly pictured with a more pink tinted bow. In Sailor Moon Crystal however she is sporting a red bow throughout. So it really all depends on what season of the anime you're talking about or if you are only referring to Crystal.
Her hair bow is red (the story is that the guy she had a crush on in the Sailor V manga said she'd look good in a red bow so she's worn one ever since), and red represents love too (as I mentioned with Moon). She and Moon have some of the same colors, this could be because of their similar personalities. Sailor Moon (Classic, R) - She had a crescent moon insignia on her red choker, the tops of her boots, and also had her transformation brooch in the center of her front bow.
Her dominant color was blue (collar and skirt) and her accent color was red (bows, boots, gloves, and choker). Her boots were knee. Theme color/Favorite color: Red and Black Skirt, collar, choker, and shoes: Red Ribbons: Front: Violet Besides being aesthetically pleasing, I have always wondered if her front bow is actually supposed to represent her secondary color, black.
It could even be black, like her hair, but is drawn and portrayed as purple to make it stand out. Some art makes it look more pink to distinguish it from the red of Sailor Mars or the red of Sailor Venus' hair bow. Mars and Venus are a warmer true red whereas Sailor Moon's is a cool.
Early sketches of Naoko showed each scout's sailor fuku being vastly different and unique from each other. I think the bow color probably stemmed from those early sketches. Even that aside, they all have different shoes, and they even have different amounts of white stripes on their colors! What are Sailor Moon's colors? Coming from the original anime, I always thought of Moon's original costume colors as blue and red.
I have seen some manga images, however, where the "red" parts of her costume appear more like a dark pink. I don't think it's canon, but I always associated it with their rank. Sailor Venus is the leader and has a non-matching bow.
Sailor Mars is second in command and has a non-matching bow. Uranus always struck me as head of the Outers, and conveniently her bow also doesn't match. Check out our sailor moon bow selection for the very best in unique or custom, handmade pieces from our costumes shops.
Sailor Venus' (Classic, R, S) dominant color was orange (choker, collar, center of front bow, elbow fittings of gloves, skirt, shoes, and earrings) and her accent colors were blue (front bow) and yellow (tiara gem and back bow).