Quality Control!
This is a Topshop shirt-jumper which was featured earlier in the Sample Tech Pack. It has many issues with it including the fact that the zip is broken which means it cannot be sold until a new zip is fitted. The sizing is wrong on the tag because this garment is clearly not a size 6. Also the button colour down the front does not match anything else on the garment. When washing this item the colours are likely to run causing the lighter part of the garment to become discoloured. Lastly, the cuff on the sleeves is shorter than normal therefore there is not any point in having them there.
You would need a highly skilled person to make this garment because of the zip, buttons, collars and different material types. To make this style simpler you could take the zip out and replace it with a button which would do the same job. You could also use the same material for both sections of the garment to make the manufacturing quicker and easier.