In this piece there is a bit of 'light' painting for the dress. There are several things to take into account like what highlight color you want? What effect you would like? Soft or scattered light effect?
In this is kinda scattered. So go find a decent Bokeh brush. Twiddle your brush settings until you get a nice random but tight flow.
Lets begin 1) New layer 2) Set layer to overlay 3) Pick highlight color (never white) 4) Brush setting must be on Linear light or overlay 5) adjust flow and opacity setting to your wish (mine generally are Flow 30 and Opacity 20) 6) start painting in 7) change colors regularly for the tonal range over the clothes.