Riding Coat or Ernst Casimir I; Riding cloak or Ernst Casimir or Nassau-Dietz; Gray wool riding jacket with standing collar and shoulder flaps; decorated with metal thread buttons and buttonholes; probably worn by Ernst Casimir during the siege van Roermond; Gray wool equestrian coat with upright collar and shoulder flaps; probably worn by Ernst Casimir during the siege of Roermond. Model: A very loose-fitting jacket that can be worn as a cape or as a jacket with wide sleeves. The jacket consists of two front; two back and two side panels; all - with the exception of the back panels - closing with buttons and buttonholes. The front center closure has 52 buttonholes; 40 at the side seams. The buttonholes are embossed with linen or cotton. Below the buttons there is a siege of coarse woven linen; while at the buttonholes an extra siege of impregnated coarse woven linen is applied. All buildings are cut around the hem. The jacket is - entirely in keeping with the fashion of the time - close-fitting at the chest to the sleeve holes and flared wide from there. The material is a very tightly woven woolen fabric in ribbed binding; all buildings are cut in the walking direction. The fabric width (max. 71.0 cm) was not sufficient for the wide flared sleeves; because there is a small wedge of the same fabric on the front at the hem. The standing board has been restored in the past and is no longer in its original state. Lining made of rather coarse; double-sided brushed wool fabric in linen binding. The lining fabric has all kinds of irregular small holes. According to the restoration report of Karin van Nes from 1979; the lining fabric was pale green and originally light green. The jacket and lining seem to have been wet once in the past; as a result of which the lining has shrunk relative to the jacket. Decoration: the shoulder flaps consist of ten double-folded fabric parts; which are connected to each other by means of three superimposed flat cords of braided metal wire.