I was checking out the arms at his sides image included in this question and it made me wonder how Superman's cape is attached to his costume. His cape just disappears into his collar. While his muscles are well defined and can be seen through his skin tight uniform, the capes out line below Superman's collar is non existant. Is there a canon answer? How does Superman fasten his cape to his costume? (I'm really hoping for an image that shows how it is worn.)
The cape is detachable; there are hooks just inside the collar that the cape attaches to. I do not recall ever seeing an image of these hooks, but I do recall it being discussed in both comics and Maggin's novelizations.
This was addressed in Superman #282. The cape attaches to the shirt piece by two hooks.