Gradients parameters: 

Make a copy of the new made layer and select the
Free Transform option to narrow a little the copy and stretch it out a little the way it is shown below (change the layer’s parameters).

The layer’s parameters:
Blending Options>Gradient Overlay
Gradient’s parameters: 

Create a new layer having
20x20 px and
72 dpi and then apply the
Rectangle Tool (U) about three times and turn over the copy with
Free Transform option to create a kind of pattern of white color.