Finally a business related post.
Here's the answer to your questions, I think.
1. 99% of Somali goods are imported from China. The only thing that classifies as a Somali product is Agriculture because it can be exported to and consumed by non-Somalis.
2. Go to Alibaba.com everything in a Somali mall can be found on that website.
3.Textiles are imported from India and Indonesia. These include macawees and women's clothes. 60% of Arab clothing is imported.
And finally, your last question is branding. Many Somalis have imported non-somali made goods and merchants are not stupid. You can import olive oil and say it's from Somalia, unless it's packaged and processed in Somalia.
Look for value added strategies in Somalia, like talking goats and producing milk from them in facility that can process, distribute and market the product to domestic and cross border nations like Kenya, Ethiopia ect