Christine really liked the alteration the tailor had made to her dress; it fits her nicely now.
Because the action of modifying something The garment has to be altered to fit properly by the tailor. The process of changing or modifying is called alteration. A modification made to something's shape or nature; altered state; altered condition.
Alterations are less significant adjustments to the garment that also affect how it fits, and are often concentrated on a single fit region. Simple solutions include shortening sleeves or reducing the waist of a pair of pants. From the smallest fix to the biggest modification all comes under alteration.
So the dress might not be fitting Christine well and now after the tailor did the alteration to her dress it fits her nicely, which means the garment was altered well and changes were made for the proper fit. Thus the word that best completes the given sentence is alteration.
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