Quick one, but if I wanted to get cycling clothing made from scratch where would one start?

I’ve looked at manufacturers but they all seem to be selling their custom designed jerseys etc where as I want to design from the ground up

http://www.endurasport.com/custom/

Speak to my sister, she’s a freelance fashion designer.

Loads will accept artwork of any pattern. We used to use Endura, then Decca, now Champ Sys who are far and away the best.

depends what’s already in place? If anything?

a differentiator, strong will and lots of money would be a good start.