During the time when the world was ruled by kings and queens, many were living an average life. While most royals can afford to wear beautiful and elegant dresses, the masses are only limited to some pieces and conventionally not made of the most luxurious textile. You can discover more details about salon aprons through https://www.gnmsalonapparel.com/collections/client-robes.
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But the average living people in the medieval era were the ones exposed to labor and different household chores and they cannot escape the wrath of stains that may intrude their dresses during their work. Thus, they needed something to cover their clothes with something cheap. This is the beginning of the usage of aprons.
Sounds too fiction? Yes. But the fairy tale side, the apron is one of the earliest fashion clothing and artifacts that have been discovered during the early kings and queens.
Also, the apron can be considered as the only outfit that has maintained its use during some periods, among others.
Before it had been a friend kitchen, aprons have been used in all the first opportunity. In most medieval gowns, aprons used as an over garment most likely not connected to the main dress but well designed with ruffles or embroidery to complement the dress.
Its main purpose is to protect clothing from stains anything it is very difficult to do laundry at the time. So this makes the apron as a major part of the dress is not pure apparel were added for protection.