1. Simple

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Is the key to not looking like a mess, just get a plain shirt wither it's short sleeve or long, just get one, and good pair of jeans, and some converse or vans etc, or any simple skirt with plain shirts tbh.

2. Chill

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Get something like converse, vans, colors hoodies, and chill look to it, something more 90s or 80s mixed with 2017 look

3. Modest

Image by ♕L'Amour Fou♕

Fine something from Zara or sum, but make sure the dress or skirt is not too short, and too long, causee you know, and make sure it's don't show much chest as well.