This appears to be the new Scotland Home shirt by adidas, to be worn throughout 2014.
Details regarding the shirt's design have already been released, including the use of tartan details - seen here on the cuffs - the inclusion of the new Scotland crest - seemingly appearing in monochrome silver - and a spider's web pattern on the back, in reference to the legend of Robert the Bruce being inspired by its web-spinning persistence.
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The shirt, apparently pictured on sale prematurely or being prepared for sale, also seems to have a red v-neck collar design and silver adidas stripes.
Thanks to Martin