Shop Men's at RalphLauren.com, the Official Site of Ralph Lauren. Custom-Fit Regent Dress Shirt - Crafted from smooth cotton twill, this trim-fitting Glen plaid dress shirt features our handsome Regent collar and signature embroidered pony. Medium-spread Regent collar. Applied buttoned placket. Long sleeves with buttoned barrel cuffs. Split pleated back yoke ensures smooth, contoured shoulders. Curved hem with gussets. Our signature embroidered pony accents the left gusset. 100% cotton. Machine washable. Imported.