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  First, I started by cutting the skirt. I used the original bottom hem for the sweater and sewed it to fit around my waist. 

  Second, I measured equally from the neckline outwards around 3". Cutting a concave circle for the armholes and then downwards. Turning the fabric inside out, I pinned together the sides and sewed them together and hemmed the bottom of the tank and armholes. 

  With the rest of the fabric being the big sleeves, I sewed the two sleeves to make a sweater.