I have made templates of envelopes used in printing and can be used in card making when trying to decide what size card to create! Do you have an envelope in the size you want to create. Do I want to make my card to fit this size envelope? Just simply go by the dimensions on the template and design the size of your card. The template is also used in printing when determining what size envelope you need for brochures, announcements, etc., to fit in.
4 Bar - 3 5 /8 x 5 1/8
Bar = Baronial size