There's plenty of that type of clothing on the island already, at least what I imagine it to be, but it's not very well made. Also some custom clothing available which is very well made, comfy and bright.
The young people on the island like to be hip but not sure their paychecks can afford high-end brands. Not sure the tourists would shop much for clothing like that either as the atmosphere in San Pedro is very laid back.
Hope this helps!