Originally Posted by Xapi
Well, I know the word is pants, but pantsless just sounds... off.
I just did some quick looking of my own, and what I found would confirm Dr. Gamera's findings. Almost no dictionaries recognize either word. However I can say that most internet uses of the word involve the "pantless" variation, although pantsless would seem more technically correct. However many English words do not follow technicalities so I say do as you will.