I did a small cycling apparel "business" the past few years so I'd offer you some advice - I don't think you'll find value in asking ppl what they want - it's about surprising them; that's the whole key to selling someone something they don't actually need. As for what to make, the answer is easy - make something that YOU would want to wear. Sometimes your sensibilities will be off though and nobody will get what you're trying to do.
oh the memories of peak moped, this one was a home run, lol