Mercer+Mettle Long Sleeve Twill Overshirt Product Company Casuals Mercer Oversized Shirt With Embroidery Mercer+Mettle Long Sleeve Twill Overshirt Product Company Casuals The Mercer Brand Official Website and Online Store Mercer Amsterdam. This B. D. Baggies Macer shirt combines urban style with functionality and classic charm. Crafted from 100% high quality cotton, this shirt features carefully crafted details such as the side pocket with flap closure and the embroidered brand logo. Available in many different colors, the garment's design is enhanced especially by pastel shades, such as light blue and delicate yellow