In preparing for their sister's wedding, Karen and John are told that ""a custom is something that people do for many years until they do it without thinking"". With this new knowledge, the two go out to gather something old, something new, something borrowed, something blue, but the objects they come up with are far from traditional and include a leaf, a penny, a cat and a bunch of flowers. Even young children will appreciate the humor in such an inappropriate grouping, though they may be disappointed in the uninspired ending. Illustrations as well as the text are not lively enough for the occasion.