Final answer:
The sentence can be completed as 'She bought an apricot and shell pink, well-fitting, elegant, new dress.' This integrates the color, size, shape, and age of the dress, based on the provided textual references, and creates a vivid description.
Step-by-step explanation:
The sentence 'She bought a color size shape age dress.' can be completed using descriptive words from the provided references. The color of the dress, as mentioned, is an apricot-color that fades into shell pink, which is complementary to Amy's complexion.
As for the size, none is specified, but we could infer that it fits her well since there is no mention of it being too large or small. The shape, although not directly stated, may be dainty and refined, as alluded to in phrases such as 'lovely little sample dress' and the fine pairing of colors.
Finally, the age of the dress is not given, but from the context, it appears to be new, especially since it is being tried on in a store and is described with vibrant colors rather than faded ones. Thus, a possible completion of the sentence could be: 'She bought a apricot and shell pink, well-fitting, elegant, new dress.'