Does anyone knows for certain what the initials in (GAP fashion) stands for?

GAP originally known as ‘The Gap’ was started in 1969 by Donald Fisher and Doris Fisher. ‘GAP’ does not stand for gay and proud. It's only an urban legend that incorrectly states that it stands for gay and proud.
GAP is a clothing brand that derives its name from the word ‘generation gap’ between adults and children. The Fisher’s were frustrated with the lack of fashionable styles and decent customer services. They decided to come up with their own brand of clothing. ‘Levi’s for Guys and Gals’ and ‘Fall into the Gap’, were two of their early mottos. Around 1982, they decided to focus on the private label clothing and by 1991-92, stopped carrying Levi’s.