My shirt size is XL. My Samsung Galaxy 6 easily fits in my chest pockets with 0.5 inch room to spare.
I am away from home now so I can not give you the exact dimensions at this time but the pockets are good size. I think the IPhone 6s should fit in the chest pockets. I don't know how big is the black rubber otter box. Will be home late 6/21 and can give you the exact measurements if you still needs them.
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