Hi there, I have to agree with Paul Ashdown here on this one. I am also in the 'fashion' line - I have just completed making my own collection of samples, which I stitched and made myself. The reason why I did this, was to take out the need for a pattern cutter, and plus I would be able to see whether the fabric that I chose actually held down the style that I envisioned and that the product itself actually works! I sketched out the designed in a note pad, went out to buy the fabric, which I want the products to be made from and then I got out my sewing machine and made them myself, using a dummy for measurements etc. This is what designers did and still do traditionally. When people get samples from the manufacturer, it is to check not the fabric and the styling - but the quality of their production of the actual final product.
The manufacturer usually is not the one to do the running around for you - you need to decide on the fabric yourself, think why you chose that fabric in terms of your target audience, how much your customers would pay for it and why. For example, there are so many different types of silks available, there are chiffons, organzas, crepe, satins... the list goes on. Which one do you want for that particular product, and why? What colour, will the fabric shape the design you want? Will it be wearable? You cannot outsource these things, because these are the things that make up your product - otherwise, you simply have not 'designed' it. Designing doesnt stop at making a sketch on a computer or a piece of paper, its a lot more then that... you also have to think about seasons, trends, forecasts... there is so much in this, which ultimately all affect your product and the styling and what fabric it is made from. How would your manufacturer know any of this? All they do is operate a machine.
Even though I have made the samples myself with my own hands - I would STILL need to get samples made by a manufacturer, who will use my samples as a template. I need their samples, in order to check the quality of the product that they will eventually sell to me. I still have to provide everything to them - the fabric, the buttons, the thread - everything. You might want to use a special type of thread, if you are using silk, for example you cannot use any kind of cheap thread, and if you have silk which needs lining, you cannot use any lining fabric - that too has to complement the main fabric used and the fabric has to complement the style.
Just my 2 cents

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I understand what your saying however with children's garments which I'm doing the fabric has to be 100% cotton so I'm not dealing with different types of fabrics!