The problem with this research is based on Desoser's definition of language as a system of signs, so any change that occurs to the elements of this language causes confusion in the general balance of its system. The theatrical discourse is a system of signs that represent a form of language. As the costumes reflect an aspect of the theatrical decor, it forms part of the sign system for this literary art. In the play (Roy Bla), which is based on the game of masks, the servant disguises himself as a gentleman. For the recipient, this outfit becomes a distinctive mark from the moment it no longer represents the socially recognized function. This sign gradually gains an intensity related to its meaning when it is included in the system of theater scenes. This sign will only regain its social function when the character leaves his mask.