Satin V-Neck Midi Tea Dress

I love the material, cut, and colour. The dress, which I bought for a wedding, is very flattering. The only thing wrong with it is that the sleeve cuffs aren't hemmed all the way around and the inside of the cuff slips down and shows, especially on the back. I thought it just might have gone unfinished but I can see this on the model for both the black and navy dresses, looking closely enough. I would stitch it myself but don't know how without the stitch showing on the outside, so I will probably pay for a professional to do it. This is annoying as the dress cost more than I would normally pay in the first instance.