Young Black Haired Girl With With Long Hair And Blue Eyes Shows Off On The Floor On Pillows

The main distinguishing feature is whether the pillow case is plain or with a valance around the edge. In the former case this is described as 'plain style' and in the latter as 'Oxford style'.
"Oxford...has a 5cm-10cm valance round all four sides. With a hemstitched or corded decoration around the inner edge of the valance"
The opening/closure of pillow cases ranges from the straightforward approach in USA called simply 'bagstyle' to the more usual European method with a pocket inside the open end to fully contain the pillow. This is Housewife style.