When your clients trust you up till this point of giving you money to choose a suitable design that fits him, just be rest assured that he his sure you can deliver exactly what he wants.

I can't agree more with you on this, and shopping for materials is not something you can do in haste. You're doing great that's why they trusted you to this extent.

It would have been better you show the materials you bought one by one and the kind of dress you intended to sew with them. Mentioning the material's name and their prices wouldn't be bad.