I am interested in starting a clothing brand. It will be based in California. What are the things I should know and things that I will need?
What's your target market?
This brand should revolve around skateboarding and hip/hop culture. That means lots of brand endorsements, sponsorships, and EXCLUSIVITY. Look at Supreme, Diamond Supply Co., Palace, Bape, Pink Dolphin, etc.
You. Will. Fail. Girls want foreign big brands. Tip: Instagram Sponsorships. A LOT OF THEM.
Depends on what age group/class. Most men just wear whatever their wife buys them. Upper class likes European.
Similar to above... But more complex.
They wear what their parents buy them at Macy's.
What do I recommend? Don't do it unless you got a lot of connections or you can start a real avant-garde movement that really grabs attention.
Making clothes is like making art. Think about who you're producing for, how they think, what YOU wear, and how YOU think. How will they feel when they see it in a store? What kind of store? What about seeing it on someone else? In a commercial? What's your audience?
Tl;dr, why buy your clothes and not someone else's?