Share process constraints
Describe the press, usable platen area, common blank fabrics, and difficult placements such as seams or pockets. Ask for a transfer sample sized to a real job rather than a generic swatch.
Prepare transfer purchasing briefs around your blanks, equipment, application tests, and customer approvals.
Buyer perspective
A print shop usually owns the last critical step: applying decoration to its customer's garment. That makes transfer sourcing different from buying a finished shirt. The shop needs a motif that fits its blanks and equipment, and a sample procedure it can repeat when customer orders return.

What to decide
Describe the press, usable platen area, common blank fabrics, and difficult placements such as seams or pockets. Ask for a transfer sample sized to a real job rather than a generic swatch.
Approve the stone layout, color, and physical dimensions first; then validate application on the shop's exact substrate. Keep the approved press record and finished sample together. One does not substitute for the other.
Show the customer the decorated garment or a clearly documented sample. Record placement and care instructions against the job code so a repeat order follows the same process.
Specification
A print shop can only quote a reliable transfer job when artwork, substrate, and equipment constraints are measured together.
Tie the measurement sheet to the decorated sample and customer sign-off; a saved art file does not contain the entire production method.
Send your artwork, quantity, destination, and specifications for a tailored quote.