I apologize, but I couldn't find specific information on how I source materials for my designs. However, I can suggest that designers often source materials from various suppliers, manufacturers, and distributors, considering factors like quality, sustainability, and cost. You can try searching online for more information on material sourcing for fashion designs.

Here are some steps to source materials for your designs 

1. Learn the basics of fabric construction: Understand how fabric is constructed and what fabric type is best for the product you’re designing.

2. Understand the different types of fabric suppliers: Find reliable fabric suppliers that can guarantee the stock you need as well as on-time delivery.

3. Visit trade shows and source fabric online: Sourcing fabric in person at fabric trade shows allows you to see and touch the materials. You can also find fabric suppliers online and order fabric hangers (a.k.a. swatches or samples) that you can review at your studio or office.