...can someone tell me where to buy them? (Spotted on lovely surfy looking lass in the post office today, was going to ask her but DS distracted me)
Black, 3/4 length, matt jersey fabric with elastane I'd say, and the key detail: an interesting diagonal strap around the leg towards the ankle. I thout initially they were stirrups but not so... Teamed with Birki's, if that helps 
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Anyone?!