I'm looking at the Sitka Kelvin Down WS hoody jacket and was wondering on size. I normally were a large in all the Sitka I have now. Was thinking of ordering the XL to make sure I'll have extra room for layering. If I layer much now under my large jackets I feel I need a tad more room as I it gets tight moving my arms. Guess I'm in between sizes. Will that hold true with the Kelvin Down as well? if so Ill get the XL as planned. Thanks for any feedback!!