I am the kind of person who would buy a dvd just to look at the costumes because I couldn't find decent screencaps ;) I'm especially guilty of that in movies like Marie Antoinette with these epic gowns.
Well I'll try and explain:
The seams in the back that create the "Y" shape are really a matter of style more so than construction. Their purpose is to help the dress curve and follow the naturally curved shape of the human back, while still lying nice and smooth. This could just as easily be achieved with darts, but the style of the period was these curved back seams. It's kind of a visual choice, it looks nice!
There is usually still a side seam, because these Y seams are added on shaping.
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Well I'll try and explain:
The seams in the back that create the "Y" shape are really a matter of style more so than construction.
Their purpose is to help the dress curve and follow the naturally curved shape of the human back, while still lying nice and smooth. This could just as easily be achieved with darts, but the style of the period was these curved back seams.
It's kind of a visual choice, it looks nice!
There is usually still a side seam, because these Y seams are added on shaping.