As vinyl is a synthetic material, it is not breathable like leather and therefore is not usually used regularly to make jackets and other pieces of clothing. It is also not as durable as leather and often splits or cracks much more easily.
The left upper quadrant (LUQ) contains similar organs to the RUQ. In the LUQ you'll find the left portion of the liver, the majority of the stomach, pancreas, left kidney, spleen, portions of the colon, and (again) parts of the small intestine.
One horizontal line and one vertical line is passed through the umbilicus, or belly button, which divides the area into upper and lower and left and right, resulting in four quadrants. The Right Upper Quadrant, Left Upper Quadrant, Right Lower Quadrant and Left Lower Quadrant, each of which houses specific organs.