Paying skilled labor wage $20 per hour (Don't you consider yourself trained and skilled in this craft?)
Materials $141 - $200
Labor (130-810hrs) $2600 - $16,200
Total $2741 - $16,400
I think I would ad in electricity for the sewing machine and light to work by, and gasoline to get to the store to buy the materials. If someone were doing this as a true business, they factor in everything.
That was VERY interesting, by the way.