I have been doing a secret-squirrel sewing project when my partner's not around, and have just finished it this afternoon; it's a hi-vis flat cap.

I've made him custom cycling waterproofs in a combination of black and yellow polyester, and he joked that he'd like a matching flat cap for when wearing the jacket in general rainy weather. (I'm in New Zealand, where there's compulsory helmets while cycling, so not for that.) The pattern company I've been buying from a lot recently do a flat cap... So now he has one with a black top and hi-vis yellow sides. (My only regret being that I didn't think to add some of the high-reflectance piping I have to any of seams, though I don't know where that would have gone.)

I'll probably make a proper one in wool / tweed in future, but this was a good way to try the pattern out, anyway.