Start using the Clone Stamp Tool with smooth edges on a new layer, above the girl's layer, to make the skirt's edges more blurred, by copying turn by turn the skirt's part and the sky's ones.



Blur out the layer (Gaussian Blur).



Insert now a textile's texture, above the background's layer.



Make the necessary corrections on the brightness and the contrast, applying Image ? Adjustments ? Levels.



Change the layer's type on Overlay and minimize the Opacity of the layer till 50%.