Which term describes the various garment parts that distinguish styles?

The term that best describes the various garment parts that distinguish styles is "design details." Design details refer to the specific features and characteristics that give a garment its unique aesthetic and functional qualities. These can include elements such as pleats, seams, stitching, embellishments, collars, and pockets. Each of these details contributes to the overall style and identity of a garment, making it distinguishable from others.

Fashion elements, while related, pertain more broadly to the fundamental components of fashion—such as line, shape, color, texture, and space—rather than the specific parts of a garment. Apparel components might suggest the parts of the clothing itself but does not emphasize the distinctive stylistic features that set one design apart from another. Fashion accessories refer to supplementary items that complete an outfit but do not describe the actual structure and features of the garments themselves. Thus, "design details" is the most accurate term for the unique parts that define and distinguish garment styles.