Renaissance dresses are available at the Renaissance Fair! There is one is every US state, so just look up when one is near you. They are a bit expensive, though.
The 7th planet
It was the style back then. If someone now were to go back in time, Renaissance people would think we dress weirdly
khaki and burgany.white shirt or skirt
One can buy a ladies fancy dress from the 'Macy's' store where they have many available to buy. One can also get them from 'Ace Fancy Dress', 'eBay' and 'Amazon'.
One can buy a plaid dress at a number of different retailers that sell clothing for women. One can buy a plaid dress at Macy's in store or online. One can also purchase a plaid dress online at eBay and Amazon.
Some ideas are: You could dress up as you were from the Renaissance and act like you were from that time period. If you are artistic, you could paint or draw a picture in the style of Renaissance paintings. You could make a collage of Renaissance items and styles.
You can buy a white dress in regular clothes stores.
There are several places where you can buy a trendy black and white dress. As example you can buy a trendy black and white dress online, just by typing the words in google.
Someone can buy fancy dress costumes in the UK at Argos and Fancy Dress Ball. These two stores have hundreds of fancy dress costumes specifically for Halloween.
I have heard you can buy them at Dress Barn.
amazon
The dress, as mentioned in an earlier episode, was designed by Vera Wang. If you want to buy the dress, you should look in her catalog.