Please do research on the exact decade and type of person you would like to portray.There were several different cuts and styles of ladies gowns during this period.
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Ladies' Clothing underwent a number of stylistic changes during the 18th century; a few dramatic but mostly subtle.
The following little article is an introductory overview, not an exhaustive guide.
(A gown which did not open in the front was called a round gown.) This petticoat was a skirt which was meant to be revealed (in contrast to petticoats used as underwear) and like the stomacher was of a fabric which either matched or made a pleasant contrast to the gown.
During the 1770s it became a popular option to bunch or drape the skirt up somewhat on the sides and/or rear. About the same time a style of bodice emerged which closed in front without the use of a stomacher.
An alternate outfit common to working women or used as day or casual wear by more leisurely women would consist of a jacket, skirt and petticoat.
The jacket was, in effect, a replacement for the bodice.
The skirt was sewn onto the bodice and hung nearly to floor length (longer if a rear train was desired).
It covered the back but was open in the front to reveal a petticoat.
In the 1780s and 90s a completely new style of round gown known as the chemise gown was popularized by imitators of Queen Marie Antoinette of France.
This dress was made of gathered fabric of a light, flowing weight and consisted of skirt, bodice and sleeves.
The Robe a l Anglaise (English gown, mantua) and Robe a la Francaise (French gown, sacque, sack back gown) were perhaps the two most common gown styles for most of the century though each went through a number of variations and adaptations.