Black Watch regimental cap badge and tartan. The tartan portion of this image appears to be a "muted", "weathered" or "reproduction" palette of the tartan, and is not what it would have looked like worn by the Black Watch regiment, which was rich and dark.
<a href="//commons.wikimedia.org/wiki/User:Steifer" title="User:Steifer">Steifer</a>
<span class="int-own-work" lang="en">Own work</span>