I can recommend FX-D leather from Milly's Cameras, cost a tenner, really nice and flexible and sticky. It helps if you have done it before and you will probably need a scalpel / jolly sharp knife. (For the leather, not yourself in frustration.) Much nicer than the not particularly flexible, not particularly sticky vinyl that I have also just done a Contax 139Q with, vinyl bought elsewhere. The Yashica was bought for £7 for spares for the Contax, but it was perfect apart from the covering and a trashed battery holder, so new battery bit, leather, seals and foam and it is luverly! Oh, yeah, the Contax came with the 28mm DSB (Advertised as with the ML, a bit miffed but it was dirt cheap) but the DSB ain't so bad. The FX-D is now my weapon of choice, with a Zeiss 35mm T* on the front