“What interlining would you recommend for wave curtains? I have ask an experienced curtain maker who said it is problematic to interline waves as they don’t hold their shape at the bottom and the hem fans out. Any advice would be welcome.”
When you interline curtains you usually turn up the interlining inside the hem for 3-5cms. This gives the hem some weight, and also makes for a satisfactory soft fold at the bottom edge. But as your curtain maker says, this extra fullness/thickness at the base of the curtain means that, in a wave curtain, the hem will fan out at the bottom and spoil the look.
If you try and solve this by cutting off the interlining right at the bottom edge of the curtain there is a danger that when the curtains hang – because different textiles hang out differently – the interlining will not drop right into the bottom fold of the hem, but actually pull up by a few mm, leaving a bit of the curtain at the bottom with no interlining in it, which looks nasty!
There isn’t an easy answer to this, apart from not interlining at all. I might try and get that soft look by using a very fine interlining – a domette, rather than a heavy bump. To keep the thickness at the hem to a minimum, I would turn up the domette in the traditional way, but only have a single hem in the face fabric, with an overlocked top edge rather than doubling it over to hem. But there’s no guarantee that this would work!
Have you chosen your fabric yet or still planning? My recommendation would be to buy a metre or so of your fabric, buy some domette, and make a mock-up of the hem, trying various options, then hold it up in folds and see how it hangs. If it sticks out, then you know it’s never going to work – see the guide below. It’s a bit of trouble and expense, but better than making a bigger and more costly mistake!
Since The curtain rod is top ten in quality, I believe you had answers to whether we should interline wave curtains or not.