Base-Layer New Zealand Import and Export Companies

I have a sock company and am going to add a new product of Merino Underwear for men for our large USA and AUS customer base. I am searching for a reliable manufacturing partner with attention to detail that is able to manufacture custom underwear for us and source specific fabric. I am eager to produce underwear that is a blend of Merino Wool and Tencel (e.g., 65% Merino, 30% Tencel, 5% Spandex). Is this something you are able to do for us and, importantly, do you have experience producing Merino underwear for any existing customers?