To post a Polyvore set in your blog:
1. Create and publish a Polyvore set.
2. On the Set page, click the Blog button on the right of the set.
3. Choose the layout for your set.
4. Specify the image size in the Image Size drop down box. You can choose from the default sizes, or choose Custom to specify the width of the set on your blog.
When you specify a custom size for your set, Polyvore will automatically detect the edges of the items in the set to determine the height of your set. (and the rest is the same)
Embedding a set on your blog also ensures that the set is displayed in high resolution.