Studies have compared all the different types of observations (including surface weather stations, balloons and aeroplanes, etc) ingested in weather models and found that Metop data makes the largest contribution to the accuracy of 24-hour lookahead, at around 25%.
It might be a while before stylists and cold-weather dandies renounce traditional layering, but more practical-minded types seem to be gravitating toward the single but versatile piece of outerwear.