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Hi Peter,
Your “how deep is half of a hole” made me smile:) I understand you need an estimate for potential investors.
First, take a look at this post that can give you some ideas about the costs involved in product development: https://memberzone.apparelentrepreneurship.com/garment-costing-example/
You’ll need on average 3 samples per style before you reach your salesman sample. The manufacturer will typically charge you 2xFOB per sample.
Patterns could average a couple of $100 per style.
You’ll need a designer that can help you with ideas/concept, sketches, tech packs, and also to fit and comment of samples. An experienced designer could charge $500-$1000 per day.
An estimate is that the design phase takes 1-2 days per style.
Then 1/2 – 1 day pers sample, to measure each sample, double-check all details, fit and comment, gather all comments and communicate with the manufacturer.
Remember that some basic styles, such as a hoodie and a polo shirt could be directly developed by the manufacturer and thus reduce the cost dramatically. They might also have “private label” styles that you could use and add your branding.
Hope this info helps to create some estimates.