Is Sienna Miller's Denim Vest a Yes or No?

Courtesy of SplashNewsOnline.com

Is it a denim disaster?

This isn't the first time we've seen Sienna Miller sporting a denim vest! It seems to be her fave new fashion find, but we're torn this time. We think it's all in how the denim vest is worn. Is Sienna doing it right?

In the past, we've seen Sienna Miller wear her denim vest over a little sundress. And that look is one that we can really get behind. But the other day, Sienna was spotted walking her dog with a friend and her denim vest took on a whole new look.

This time, Sienna was wearing her denim vest with a grungy-looking shirt and a pair of jeans. The jeans were a couple shades darker than the vest, but we just didn't think the look worked very well. Let's face it, the only reason you'd wear a denim vest would be to look fashionable, right? This particular vest adds no warmth or function to an outfit, so Sienna must have thought it would had a certain fashionable flair.

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We are happy the vest isn't the exact same was as her jeans (a definite fashion no-no), but we still don't think this look works well. Do you think Sienna can rock it? Or should this only be a "walk the dogs" outfit?

One thing we do have to admit - she looks great in a bikini. Check out the pics!