Look what I got!
It’s a hem marker. You fill the little cup with chalk powder, adjust the height to where you want your skirt to end, then do a twirl whilst pressing the bulb. The result is a series of neat white lines on your skirt.
I’ve practised with it once using a skirt that had already been hemmed. You have to stand quite close which is awkward if you have feet. The white lines are very clear but I didn’t get them completely straight, probably because I need to stand better.
I think with practice it will work well. Did you get any sewing related Christmas presents?