Bell sleeves were originally found on a garment called a chasuble, which was the dress of clergymen during Medieval times. The religious association of these sleeves eventually dissipated at which point the bell sleeve became adapted by the upper class.
Bell cuffs were initially discovered on a garment called a chasuble, which was the attire of clergy members during Medieval times. The spiritual connection to these cuffs eventually faded, allowing the bell cuff to be adopted by the upper class.