While marginally better than the 3/4 length leather carcoat, leather blazers were over-exposed in the late nineties, and are now a bit cliched, like goatees and silk shirts. Manton's going to like this next part. I think that just as there is an optimal tie width and jacket length, there are optimal and sub-optimal choices in terms of materials for different clothing articles. Worsted wool, which combines a natural drape with the ability of hold structure, is perfect for suits - cotton and linen, which tend to lose shape and rumple, not so much, despite the efforts of designers every S/S season. Both are, on the other hand, ideal for shirts, because they can conform to the structure of the body. But I digress. Leather naturally creases after minimal wear, which makes for a great casual look, but makes a more formal garment like a blazer look sloppy. Leather shirts are an aberration not worth discussing. Leather is best confined to belts, shoes, watch straps, and casual jackets.