above JOHN SALADINO
Most designers won’t work with fabric you have purchased elsewhere, preferring instead to provide you with the fabric themselves. There are many reasons for this:
There is huge liability when using the client's own fabric not to mention extra foot work.
When we order fabrics from our own sources they automatically ship them directly to our workrooms.
Frequently fabric has flaws. Because we have long standing relationships with our fabric sources, we have recourse and are provided immediate replacement at no additional cost.
Often times there isn’t enough fabric to complete a job when client's order their own fabric and this creates all sorts of problems. Say for instance you have 75 yards of fabric and you discover you need 85 yards. If the fabric is no longer available you won't be able to complete the job. Experienced designer's foresee these things "before" ordering.
Ultimately, it is necessary for designers as business people to have the built in profit from purchasing their fabrics at wholesale and selling them at retail in order to cover the myriad contingencies inherent in window treatment designing.