Firstly, in order to wear leggings as pants, it is important to have a smaller, not so evidently sexy frame. Meaning, a woman with voluptuous hips and bodacious booty would cause the look to appear overly sexy; while someone with a smaller, less curvy lower half would bring a needed monotony to the look and the sex appeal would not be so blatant.
Oversized tees, flannels or sweatshirts are best with this look because it brings in an effortless, cute factor; however, a fitted tee can work as well, as long as it is not bursting with sex appeal.
As a whole, the mastering of this look basically comes down to an effortless approach. Thinking more comfy, cozy, and casual rather than hot and sex kittenish will allow for perfect execution, trust me, the sexy thing will creep in there on its own.
(hk tee- hot topic)