Final answer:
The spaghetti-strap top that transformed from underwear to outerwear is a camisole, a lightweight, versatile garment that can be styled as outerwear or worn under other clothing.
Step-by-step explanation:
The spaghetti-strap top that has transitioned from underwear to outerwear and may or may not end in "sole" is known as a camisole. This type of garment is generally lightweight, sleeveless, and features narrow straps. The camisole was traditionally worn as an undergarment, but in contemporary fashion, it has become a versatile piece that can be styled as outerwear. It can be worn alone or layered under jackets, blouses or dresses, such as the scenario described where a dress was slipped over a girl's pink blouse. The easy transition of the camisole from undergarment to a stylish top illustrates its adaptability in women's fashion.