美国采购需求：男士超大码T恤，男士加大码T恤，男士Polo衫，热升华印花T恤，动漫T恤，空白T恤

I'm launching an outdoor apparel brand and need a manufacturer for a custom down puffy jacket designed for various outdoor activities. Key features include a recycled nylon shell, RDS-certified down, and specific design elements like adjustable hoods and waterproof zippers. Can you handle custom samples and small-batch production? I'm interested in your experience with technical outerwear, your sample costs and timelines, MOQ for bulk orders, and production pricing. Additionally, do you offer material sourcing and have any sustainability certifications? I'd love to see photos of similar work you've done.