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The sizing is also normalnot like most formal wear

Crafted from airy white cotton with subtle textured detail, this midi silhouette features a flattering V-neckline, softly puffed sleeves, and a smocked back waist that defines your shape while keeping things comfortable

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Again, if you get an odd number, round up to the next even number to get your band size

Button-up (shirts with no collar buttons and stiffer collars) and button-down (buttons fasten the collar to the shirt) can both be used for business casual