Maracas is one of the high-end stores on Portola Drive with display windows featuring posters and finely dressed mannequins. The store is inaccessible to the player and plays no part in the story.
The brand's real life equivalent is not known, as no known high fashion brands seem to use the Bodoni Poster Italic Script font used in their logo. The brand may have Spanish or Mexican origins as Maracas are Spanish instruments, but can also be used as a slang term for breasts.
There's a possibility it may be inspired by Rochas by French designer Marcel Rochas, being that Maracas is a near perfect portmanteau of the designer's name. Although the name is Spanish, this is further enforced by the fact that the real life building is occupied by another French fashion designer.