Metallic thread for an upcycled Kimono –
If you dare go all the way, I suggest using metallic threads.
They are basically designed for embroidery so they break easily when used with a sewing machine. To get around that, it is wiser to stitch slowly and combine the metallic thread with a polyester thread of the same hue. This combination has two advantages: it strengthens the stitches and the thread tends to break less, but it is also less costly.
The cheapest option is Madeira. They sell a case with 18 metallic bobbins (200 meters long) at a very affordable price on Amazon, which means it will be hard not to find a hue that enlightens your fabric: £ 26.40 for a range of 18 sorts of thread on Amazon.
DMC Diamant offers a very attractive palette. The thread is 38,2 metres long and the price starts from £1.55 without the shipping fee.