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When you have narrow shoulders wear off-the-shoulder and boatneck tops. they will add width and focus more attention to the neck and shoulders. maybe try wearing shoulder pads, go for the small ones. wear sleeveless, boxy tops, it will create a broader and more square shoulders. get tops with horizontal stripes this will visually broaden your shoulders. you can play around with studed shoulders or any kind of ornamentation, this will bring attention to that area. also go for jackets with wide lapels.
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