I can't look at this adorable little pugilist getup without thinking of Little Mac from Smash Bros. Which is sort of fitting, considering that a League of Legends designer admitted that Lee Sin is a "problem" earlier this year.
I guess the boxing gloves are sort of a given -- though one cool detail is that the skin changes Sin's ult (shown in the GIF above) from a kick into a punch. Here's what it normally looks like on regular old Lee Sin:
The bells are also a nice touch:
Now let's see if Nintendo follows suit with a new monk get up for its boxing champ. (Don't hold your breath).