A black waistcoat front sits between broad smooth-looking lapels here. White shirt and black bow tie establish a light-dark centre, with small pale pocket details appearing beside the chest. Hands are in the trouser pockets, producing a particular front stance. Only part of the trousers is shown below; hem and shoes are absent. The picture helps compare visible surfaces and the distribution of waistcoat buttons. It does not answer how the whole combination falls with relaxed arms or how you want to use it while seated.
Request another stance without hands in pockets on the actual candidate first. Then compare the same chest and waist area with the intended waistcoat. Do not derive a general statement about stretch or movement space from the dark smooth field. Add a full trouser view with real shoes. If you want to retain the definite waistcoat front, describe it separately from the jacket width you prefer. An appealing black front need not also select an unknown lower finish. A seated test adds the use that the standing upper crop cannot establish.