Thank you all for your thoughtful counsel. This is helpful! It seems like the cobalt is in the lead, and I think I'm inclined in that direction, too.
Carla, I actually looked up your old posts from last year and saw that you brought your lilac coat but rarely had to wear it. I'm hoping we'll get lucky with the weather, too, that way. Still, best to have something in hand for showers and cooler mornings and nights.
Rejoiceandbe, yes, I'm counting on similar weather to my own, which does make packing easier. It is a bit warmer here in Victoria, but very close. As for whether I prefer to stand out or blend in, I'm indifferent. Either works for me if I am happy in what I am wearing. Since Hobbs is a British brand, I expect I might see someone wearing a similar coat, even if in a more subdued colour...
Re a hood -- yes, well. That may be one reason (but not the only reason) I wear my old J. Crew utility coat so often. So I will be on the lookout for a similar type of coat. In the meantime, I do have foldable umbrellas and also a fun little matching rain hat! (I will take pics later).
Very good point about squashability, Rejoiceandbe. I had been thinking of that, too. I'm going to experiment a bit and see if my cobalt coat will fit into my tote should I want to carry it about.
SarahDB, nice idea to look for a scarf that includes cobalt and bits of black. I actually have one that comes close (it's got ink, not black...and it's not really cobalt but there are brighter blues in it).
Thanks, harmonica! And yes, I will keep an eye on the forecasts.
Phoebe, it sounds like you share my ennui with darks as the sky lightens.
Sal, that's a great bomber. I love my J. Crew untility coat and would love to get another just like it! It's been the best thing ever. But I do prefer knee length or longer for possible rain.
Jaime, thanks. I guess black always blends, doesn't it. And might be safer on the tube. But I like the colour of the cobalt....
Dee, thanks for enabling some possible shopping in the UK!
Thank you Angie, Janet, Ket. It's interesting how a colour can just work, right? And how different it can make an item look? I knew when I saw that Hobbs coat on sale 2 years ago around my birthday that it was going to be my gift to myself. Even if I don't wear trenches as often as I would like, I might as well have one good quality one in a fab colour. As yours sounds, Janet!
Thank you to all of you (even if I didn't name you, I very much appreciate your thoughts). I think my decision for now will be to bring the cobalt and my rain hat and umbrella and consider a bit of shopping for a dupe for my utility coat -- or something I haven't yet imagined.