Xesai/E+ via Getty Images There's been little to celebrate at Unifi (NYSE:UFI) since my last update on this U.S.-based polyester yarn company. Retail spending has remained lackluster and while retailers are done with their large inventory restructurings, they've been cautious as a group when it comes to restocking/reordering. Couple that with ongoing volume growth from Asian producers, and it's a tough set up for Unifi that has led to ongoing weakness in revenue and margins. Unifi's shares have dropped anot ...