All of my pieces are freehanded one-offs, and I do not work to standardised sizing.
My jumpers and sleeves are made with very flexible sizing in mind. My sleeve tops have a wide opening at the chest and balloon sleeves which can accomodate a variety of body types and sizes. All of my pieces have give and will naturally stretch slightly over time.
I'm planning on having my pieces shot on a variety of different body types in the future, which should help with picturing the fit!