Hey, Star... I'm picky about details, so I HAVE to say it...
Ren wears loose clothing. This is to make it impossible to read his body language, so the subtleties of his muscles won't give away when he's about to attack. it also helps break up shape and silhouette, to confuse the eye and help him hide.
Silyo, on the other hand, wears clothes that fit. Think of the difference between monks and what is commonly seen as ninja, respectively.
don't eat me, okay? I like to have details grasped just so.
Of course, if you eat me, my posts stop coming.