My sewing threads for dark blue are both a little bit off from the skirt fabric colour, but... It won't be all that visible from a short distance, and will likely be obfuscated by the visual weight of the buttons as well. Which I need to order, the buttons.

Also: the phone camera likes to be very confused about what colour the fabric is, as per usual. It's a very very dark more indigo or teal than purple hued blue, and absolutely refuses to be perceived the same in artificial versus natural light! But pretty.