I personally think purple eyes is a girl and green eyes is a boy, and they simply like dressing the two up cutely ^^ They usually wear the exact same outfits, with the color being the only difference.. But in chapter 34, Pinkie wore a dress, and Greenie wore a similar one but IG what you'd call a more masculine version, since instead of the same dress or a skirt, Greenie wore shorts. And the outfits they wore that were the same are nongendered ones >< Though I myself don't think clothes are gendered, looking at it thru society's pov, it could be an indicator that Greenie is a boy(Though, a very cute one)

Are the twins both girls or boys or one girl and boy? Because of the hairstyle my eyes scream girls!! But I'm like maybe they wanted to grow their hair out?