https://en.wikipedia.org/wiki/Pocket

In medieval Europe, early pocket-like openings called fitchets appeared in the 13th century. These vertical slits, cut into the outer tunic, allowed access to a purse or keys suspended from the girdle beneath.[3] Historian Rebecca Unsworth notes that pockets became more visible in the late 15th century,[4] and their use spread widely in the 16th century.[4]

Later, pockets were often worn like purses on a belt, concealed under a coat or jerkin to deter pickpocketing, with access through a slit in the outer garment.

By the 17th century, pockets were sewn into men's clothing, while women's remained as separate tie-on pouches hidden beneath skirts.[5][6]

https://en.wikipedia.org/wiki/Reticule_%28handbag%29

A reticule, also known as a ridicule or indispensable, was a type of small handbag or purse, similar to a modern evening bag, used mainly from 1795 to 1820.[1]

The reticule became popular with the advent of Regency fashions in the late 18th century. Previously, women had carried personal belongings in pockets tied around the waist, but the columnar skirts and thin fabrics that had come into style made pockets essentially unusable.