Tin Cloth Fit Check

5’7”, 160, 38 chest, 31 waist

XS Tin cloth field jacket, here I’m wearing a button down and sweater under, still have some room in the chest and abdomen. Sleeves seem dead on, not sure if this is relaxed ‘enough’ but sizing up to S would add 3/4” to sleeves, about an inch to the shoulders and 3” to the chest (44 to 47). Thoughts? And yes this is the same one I have posted for sale