Dressing room

The storeroom is not a suitable dressing room. A separate room is needed where workers may change from street clothes to uniforms and where they may keep their personal belongings.

Source: wiktionary

That on Sunday the 10th. of June laſt paſt, about 9 of the Clock, as he came out of the Chappel at Whitehall, after the firſt Sermon, hearing that the Queen was in Labour, he, the Deponent, made Haſte to St. James’s, becauſe in waiting, as an Officer of the green Cloth, to warn the ſeveral Servants below Stairs to be in their Offices, that upon that Occaſion there might not happen to be any Thing wanting of Houſehold Proviſions and Neceſſaries under his, this Deponent's Command; but firſt going up by the Back-Stairs into her Majeſty’s Dreſſing-Room; and being there with many others, he heard her Majeſty cry out very loudly; […] and as this Deponent was returning back to the Queen’s ſaid Dreſſing-Room, he was told a Prince was born: […]

Source: wiktionary

The principle which governs the providing of Dressing-rooms seems to be this. […] Then comes the case of one Dressing-room, by which it may be said the gentleman's toilet is taken out of the lady's way, she retaining the Bed-room; and this admits of the attendance of a lady's-maid. Then follows the case of two Dressing-rooms, which in its simplest form supposes the lady not to give up the use of the Bedroom for dressing, but to make use of the inner retiring-room for washing.

Source: wiktionary

I received a note from my Lady Primrose, who desired to see me immediately. As soon as I waited on her, she led me into her dressing-room, and presented me to――

Source: wiktionary