Simplicity 8558, Copyright 1969, Boys' Bell-Bottom Pants and Vests: The bell-bottom pants V. 1, 2 & 3 with fly front closing and pocket concealed in side seams have front waistband and back elastic waistline casing. The lined vest V. 2 & 3 have "V" shaped neckline. Longer vest V. 2 has front button closing. Shorter vest V. 3 has shaped front edges.