The Belgium Dress is picnic-approved and concert-ready, featuring short puff sleeves and a square neckline. Dress it down with sandals, dress it up with heels, or go barefoot and run through a meadow if that's more your style. The Belgium Dress is picnic-approved and concert-ready, featuring short puff sleeves and a square neckline. Dress it down with sandals, dress it up with heels, or go barefoot and run through a meadow if that's more your style. Founded in 2009, Reformation is a revolutionary lifestyle brand combining stylish, vintage-inspired designs with sustainable practices. With each limited-edition collection, the LA-based brand empowers individuals who want to look beautiful and live sustainably.