I think the problem is consistency. Where the models are wearing other QVC items for the shows (be it a jewellery, shoe or handbag show, they should expect there will be interest going beyond the products being sold and should flash up the other QVC products which are being sold. They could also show similar items to the ones models are wearing if these are not QVC stuff. Basic sales, surely? Upselling beyond the immediate product being promoted. It's been a while since I worked in sales, but I was always told to upsell (recommending other products which go alongside the product the customer asked about) where possible.
It would require them to get their act together more than they do today. When you look at a product on the website there is on the right hand side a "you may like" but it usually shows similar products to the one you looked at - never complementary products.
This is one area where Debbie Flint is undoubtedly very strong. She often prompts the behind the scenes bods to put up details of products, and sometimes (like with a Kipling bag and a Centigrade TSV in similar colours) getting the product out so she could show how well they go together. In this respect, I find her very professional and well-prepared. I just want her to bin the endless self-promotion, permanent attachment to iPad. I filter out the hard sell (buy two, buy three, don't miss out, get yours now etc).
I also think it would be extremely interesting if QVC insisted all the female presenters had to be dressed top to toe in QVC fashion (including shoes)... that would get rid of the deadly toe-posts Julia loves so much, and also Debbie's white peep-toe wedges, as well as the more monstrous shoes Jill Franks loves amongst others. It might then force them to look for a wider range of fashion choices than they have today. Too many of their fashion ranges have very samey fashions.