LONDON FOGWomen's Double Breasted Peacoat with Scarf

If I wear a 1x or size 18 will the extra large fit?

If I am 5.2, weigh 118 lbs, and wear about 2 thin sweaters underneath the coat, would the size small fit? thank you!!

Is the size true to the size guide? Seems to run bigger based on size guide.

Is the size true to the size guide? Seems to run bigger based on size guide.