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The virtual bible of American East Coast style, The Official Preppy Handbook , is a perennial reference, while subsequent publications including Ivy Style: Radical Conformists , Preppy: Cultivating Ivy Style , The Ivy League , and Rowing Blazers offer additional guidance

And, finally, with Sienna Miller's latest collection for M&S giving it the seal of approval, I need no further proof that this is one dress worth owning

Even after you digest our advice here, we suggest you check in with your workplace and make sure your outfit matches up with expectations

Casual fit-and-flares instead of formfitting mermaid silhouettes

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