I used the colored foam sheets that they sell at the craft stores. Used a ruler to mark the width of each section and a tracing stylus to rub and press the lines into place. For the tucks, I just pressed down hard with the stylus but you can also use the open end of a clicking pen to make actual buttons.
Jevries makes a stamp for making the patterns here: https://www.shapeways.com/shops/jevries-scale-lowriders
LowRider Model Interiors also makes premade sheets, seats, trim, and full-service model upholstery work here: https://scalelowriderinteriors.bigcartel.com/
