I kind of loathe the design they gave her in the show. Her canon design looks like a black and lime green Nike track suit. Just put the swoosh on her chest to complete the look. They also left out any sort of material pattern on the suit. (Whereas both the original Ladybug and Chat Noir suits had a material texture and pattern.) so her suit looks disturbingly smooth like latex. I mean shoot, even her own skin had more of a texture. Adrien definitely got the large end of the stick when it came to canon super suit designs. Both Chat and Mister Bug designs were fantastic, and then poor Marinette gets shafted.
So here we are, I took a crack at my own design. I imagine that the accents on her suit and her eye color are blue, like her normal eyes. And she has two different shades of black for the rest of her suit. I used Bayonetta (from the Bayonetta game series) as inspiration for her suit design, thus the pose, but still tried to retain the theme of Chat Noir. She’s got little tufts on the tips of her ears, like a lynx or a caracal. And I couldn’t decide between a belt tail or the hair tail, so I did both. I also gave her some muscle, because they made her arms criminally tooth-picky in canon.