My unit has a few Reservist personel with us. 3 C Scot R (our affiliated unit) Sgts, 1 11 Svc Bn MCpl, 1 Naval Reserve CPO2, and 1 Naval Reserve LS.
For dress, on a typical parade night, with the cadets in uniform, the officers and reservists all wear their combats as their duty dress, and on a sports night, everyone wears civilians. The only time their spit shone uniforms come out are on a CO's Parade, or other special event.