sentences:  World War I forced the reversion to brown leather boots for Other Ranks but polished black boots were still worn by some individuals or units out of habit.Officers, who purchased their own uniforms, were still required to wear polished brown boots and matching leather Sam Browne belt with their field service uniform, marking them apart from their men.Officers' boots had heel plates, but lacked the sole studs and toe plates because they could afford to have the soles replaced.