Thank you
@Efemera for that kind offer, but these have now arrived and the colours are good for the jacket.
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Only problem is they need a bigger buttonhole than the Singer buttonholer will make in one pass, so I now have to decide between:
using the buttonholer and shunting the fabric along and then back to make a longer buttonhole
using the 4-step buttonhole on the Husqvarna, which nearly always ends up with non-parallel sides
hand sewing the buttonholes
making bound or piped buttonholes
At the moment I'm leaning towards the bound variety, but ...