Margiela’s work with deconstruction in fashion was very conceptual. He used part of vintage cloths and resembling them which resulted in cloths that seem completely new. Just what Frank Gehry did in Architecture in 1977/1994 in California.
Frank Gehry remodelled his own residence in Santa Monica, started with conventional structure and used some new materials which ended up an innovative and unexpected. The bungalow was built in 1920 and Gehry wanted to experience the new materials which he was already using like plywood, chain link to transform the house into a new volume.
Maybe fashion designers and architects didn’t use the deconstruction for the same reasons but they used it in the same time.