if the rolling up not animated quite easy!
make the forearm of the top seethrough in the opacity channel and parent a resized cylinder primitive to each elbow or wherever you want.
use the original forearm texture and a wavy texture in the displacement channel adjusting sliders and spot rendering until you get the best result.
some bright spark might even post a texture they have made and even smart propped cylinders!
(not me, do not know how to make prop files for others!)
animated rollup possible too btw!
send top to Hexagon
enable symmetry, soft select and select vertices from the end of the sleeves upwards
resize smaller on x-axis and translate up the arm
add a bit of displacement all around with the displacement brush, maybe before resizing and translating
send back to Daz studio and you have a morph slider you can name then animate!