Well since the "clamps" on the hanger can slide to accommodate any type of garment they can be configured to accommodate the distance between anyone's nipples not to mention any other part of the body that one might want to attach them to.
So the answer is that they are not exclusively for nips... Just use your imagination [insert evil grin here] and let things escalate from there.
Plus as noted above it involves "improvisation", and is an effective spur of the moment thing that is simple enough so that one does not have to litetally tear the entire place apart and risk any damage to the room and the furnishings that might incur some additional charges.
Of course if one wants to be the ultimate Boy Scout and be "always prepared" then one should do a bit of advance planning. Still it's good to know how to improvise. Along those lines while I hesitate to mention what can be done with a hair drier (hmmmmm) or an iron... an ironing board could certainly be put to good use if you really think about it.