my friend took a hoodie and cut it across the chest and back then sewed other fabric into it, kind of hard to explain on here but the layers went
original hoodie (hood, shouders, sleeves)
plaid fabric
middle section of original hoodie
plaid fabric
pocket and bottom of original hoodie
essentially its cutting the original into 3 pieces and adding "extensions" of another fabric or sweatshirt, looked dope as fuck though!