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At certain points you'll be able to get new outfits and accessories for your trainer! What attire will you choose for your Trainer? You'll be able to see the clothing you choose as you explore the Kalos region! You can go back and change your outfit whenever you like.
It's outright stated on the website. Initial character creation lets your choose your gender and skin/hair/eye color from three presets (per gender). But you'll be able to customize your clothes within the game itself, which is what we see in the PSS window - which suggests that dying/restyling your hair is included.
We've also seen what the characters look like without any accessories, as Serena and Calem.