I have made two patchwork jackets.
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This was the first one - I can't remember now which pattern I used but it has very minimal shaping and that's why I chose it. The 6" x 6" denim squares (old jeans) were patched together to make pieces big enough for each pattern piece, then cut out and assembled in the standard way.
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This is the second one, the pattern is
Zambeesi which has all the separate pieces as part of the design Sew together the pieces for each section and then make the jacket. Main problem though is that the neckline is very low, it looks best worn with a high neck / turtle neck. I used a variety of silks, some of them very vintage (from David Evans) and some of them from the sales table at craft club, so possibly similar vintage!
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I have also made a quilt/cape which I often wear around the house when it's chilly. It's random squarish pieces sewn over a base layer in a mix of FPP and appliqué, then I zig-zagged over all the seams. It was make it up as I went along, but the shoulder seams, which extend right down are at the correct angle so laid out flat the fronts overlap. It's more than just a single piece of base fabric. I added top stitched "side seams" to make the sides of the thing into "sleeves"