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Emma Watson, known for her sophisticated style and iconic roles, often experiments with bold fashion choices. If she paired a sheer dress with a "divisive" hairstyle, it’s likely that the hairstyle stood out for its uniqueness or unexpected nature. 

Styles like bold pixie cuts, asymmetrical bobs, or dramatic color changes can often spark debate among fans and fashion critics, as they push boundaries while still reflecting Emma's progressive, confident persona.

Her sheer dress would probably be elegant and daring, embodying both sensuality and refinement. As Emma is known for balancing style and sustainability, the dress might also include eco-friendly or sustainable elements. 

Whether or not fans love or dislike the hairstyle, Emma Watson’s fashion choices consistently make headlines, reflecting her status as a global style icon.