I bought this dress online and it arrived today. www.marksandspencer.com/floral-frill-detail-midaxi-tea-dress/p/clp22526074?color=BLACKMIX I really like it (even though it's longer than it looks) but I can't do the zip up at the back. I live alone so don't have anyone to zip it up for me. Any ideas? I thought about adding some ribbon to the zip but there's no hole to thread it through. I don't want to send it back for this reason. Please help.