Facings
From its establishment in 1685 the regiment had a red coat with yellow facings. This was originally the colour of the cloth lining of the coat which appeared in the turned back cuffs, skirts and lapels. Later, as uniform styles changed it became the colour of the collar and cuffs of the jacket or tunic. A royal warrant of 1751 first regulated the facing colours of the "Marching Regiments of Foot". Those of the 13th Foot or Lieutenant-General Pulteney's Regiment was given as "philemot" yellow, a description repeated in the next clothing regulation of 1768. "Philemot" was a corruption of the French feuille morte or "dead leaf", a shade of yellow approximating to that of a faded (Autumn) leaf. When the 13th Foot was given the title "Prince Albert's" in 1842 it became a "royal" regiment, and the facings were changed to dark blue. The braid and lace worn on officers' coats was silver until 1830 and thereafter gold. It had a black line threaded through it.
Read more about this topic: Somerset Light Infantry, Dress and Insignia