This is a vintage Simplicity sewing pattern (number 1434) for boys' size 4 pajamas. It is uncut and includes all pattern pieces and instructions needed to create this classic sleepwear. The pattern is suitable for boys of the stated age group and features a design specifically tailored for them.

The pattern's brand is Simplicity and it falls under the categories of Crafts, Sewing, and Sewing Patterns. It is worth noting that this pattern is vintage and has not been used, so it is in excellent condition. The gender for which it is intended is boys, and it includes features specific to that group, such as size 4.