From FibreMood:
Rupert is casual and cool at the same time. This oversized shirt has a standing collar and a curved-bottom chest pocket with two lines of parallel topstitching. It features a handful of other playful details from an hem line with side slits to a yoke, and a pleat in the middle of the back. Rolling up the sleeves optional ;-)
Fabric advice
There are so many fabrics that work well with the Rupert. Woven fabrics work best though due to the details. Poplin, chambray, Tencel, linen, crêpe, and flannel are excellent choices. Rupert looks great in solid and print fabrics alike.