Still a work in progress and one of the parts where most people tend to get most offended.
REMEMBER ONLY YOU can properly and completely perform the necessary due diligence to determine your costs – this article, like all on this blog, are a starting point, not the last word by any means. While I hope it is worth more, its value is exactly the same as what you paid for it – no dollars.

So if you did not start the day in your grown up panties and will tend to take this all too personally, probably best to leave now.

If you are NOT selling a finished item, but perhaps just a work for hire where the customer chooses the pattern and materials, you will need to add the price of the pattern AND that pattern should be delivered to the customer. Whether you choose to do this out of respect for the work of the designer whose shoulders you are standing on even if they are your own – both deserve the few pennies of profit that will be derived from your legal use of their product – the pattern without which you could not perform the service.

Please also be sure BEFORE you buy a pattern, that the pattern author has granted you permission to use it for the derivative function of a work for hire. You might also want to confirm that “free” patterns are also free for use in work for hire situations – some are free for personal use, but the pattern author

If you are so selfish as to be okay with stealing the work of another for your own profit, karma will catch up even if the person you choose to harm does not.