The stool became standard at dressing tables for a reason that has nothing to do with comfort: it tucks fully under the table, so it disappears when not in use. In a small bedroom that is a real advantage.
A chair is the better seat and needs more room. Its back stops it sliding all the way under, so it stands proud of the table edge - which is why chairs at dressing tables went out of fashion as bedrooms got smaller, and why they are worth revisiting in a room that has the space.
The skirt on this chair is doing something specific too. Falling to the floor, it hides the legs and makes the chair read as a soft column rather than as a piece of frame furniture, which stops a high-backed chair looking bulky beside a delicately carved table.
Our master Indian artisans set the chair's seat height from the finished table rather than the other way round, because a chair that is even slightly too high makes you sit hunched at a mirror - the one thing a dressing table cannot forgive.