The amice is a piece of rectangular cloth with two thin-longer strands on either side (to be honest- it kind of looks like an apron!). The amice used to be a mandatory liturgical vestment before the Second Vatican Council. Priests would put the amice on over their shoulders. The alb would then go over the amice. Now, the use of the amice is only required if the alb does not fit properly over the priest’s clothes.