nothing verbal - put it in writing. It sounds like she understands the time and work involved, but list everything. If you are selling a product, you are a business, so think like a business. Take a few minutes and think thru the whole project making a note of all materials used (thread, rotary blade, etc). Then you can create a work order listing fabric, notions and a per hour labor charge. You can estimate the hours needed, but be sure to add the word estimated. This person is supplying most of the fabric, so I wouldn't charge a deposit. If you are purchasing all the fabric, I take a non-refundable deposit covering most of that cost. This gives the person an incentive to really think about whether they want it or not before you put in the work. If you approach it from a business mindset rather than a friendship way, you should be fine. Or, do it as a gift and expect nothing and be pleasantly surprised at whatever they offer.