I personally love thin, stretchy blazers like this as an alternative to a cardigan or heavier jacket. I think they are a good way to cover up without having the bulk of a jean jacket or leather jacket. I own something very similar, you can see how I styled it here.
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And these blazers are an amazing deal ($14.99! And they go to 3X!). They come in several colors, not just those pictured.
Click here to purchase!
Chic on the Cheap 