This listing is for one vintage Simplicity children's sewing pattern #8813, "Child's and Girls' Bathing-Suit and Bell-Bottom Pants", size 8, breast 27", waist 23 1/2", from 1970.
The envelope is in good condition, with only edge wear and small tears to the flap and corner dings. The instructions are a little 'browned' on the edges, but otherwise in good condition. Of the pattern pieces, two are cut and eight are rough cut, but with wide margins.
This pattern was made before Lycra Spandex was made, so the fabric required is any cotton, but usually cut on the bias so there is stretch and ease.