I take an xl in old stark. shoulders and chest fill out
Ion i took a L and fits slightly large (sleeves, body and shoulders are a touch big). May have gotten away with a M but I dont mind a little extra drape. Def go tts or down one for ION
For Memento I went with XL and fits great better than L in ion
trying to make sense of your ion sizing
lists model as having a 39" chest and wearing a L. how does this fit you with a ~42" (iirc) chest?