Sienna Miller Rocks Vintage Marc Jacobs at St. Paul’s Carol Service

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Sienna Miller looked effortlessly chic earlier this month at St. Paul’s Knightsbridge carol service.

Sienna Miller exudes elegance in a striking red cape at the St. Paul’s Knightsbridge carol service, London, December 7, 2010Sienna Miller exudes elegance in a striking red cape at the St. Paul’s Knightsbridge carol service, London, December 7, 2010 (Credit: WENN)

The style icon was fashionably dressed in a lovely red cape coat, tights, and knee-high boots. She capped off the look with an interesting purse.

Close-up of Sienna Miller's unique Marc Jacobs Robert Jennifer shoulder bagClose-up of Sienna Miller’s unique Marc Jacobs Robert Jennifer shoulder bag (Credit: WENN)

Sienna’s bag is the Marc Jacobs Robert Jennifer shoulder bag from a vintage collection. Here it is in another color:

Marc Jacobs Robert Jennifer Shoulder BagMarc Jacobs Robert Jennifer Shoulder Bag, $3,300

Because it is an off-season item, it is also quite hard to find. You will probably need to do a bit of footwork to find it in outlet stores.

If you don’t mind getting something different but just as interesting, you can try the Marc Jacobs fabric and leather Parrot tote:

Marc Jacobs Fabric and Leather Parrot ToteMarc Jacobs Fabric and Leather Parrot Tote, $1,395

It’s definitely not like the Robert Jennifer shoulder bag, but the Parrot tote has its appeal; plus, it’s more current.