SO exciting! I envy you this trip and hope you make the most of it!
End of March is definitely in-between weather in NYC. Not quite winter, not quite spring. There might be crocuses and daffodils coming up. There will not be leaves on the trees. I have been there in many months. The climate is similar to Toronto's but they are a few weeks ahead.
I just. put together a travel capsule for a PNW destination for a week. I want to say it worked perfectly...but the truth is, I went shopping and wore a lot of new stuff!
However, what I will say is this, most of which you know.
1. Footwear first (and please do LOOK at footwear while there! Even if it feels too risky to buy, because what if they don't work out once you are home? -- you can try different brands/ styles and see what might work for your feet, for the future).
2. Layers. You've got this.
3. Spring colours in cool weather fabrics make the world (and you) super happy. I got SO MANY COMPLIMENTS on my lavender coat. People literally stopped me in the street. Obviously, garnering compliments is not the purpose of your trip, but I have to say, any little burst of happiness is more than welcome, right? And this kind of thing -- you are giving joy as much as getting it.
4. Bring a fold up bag for your purchases! I brought an Eddie Bauer fold up duffle inside my bag and was I ever glad. When it came time to pack to go home, I had what I needed right there.
Re toppers:
For my week, I took 3, plus an umbrella that worked with all.
1 was outdoor topper, pure and simple. (Lavender coat).
1 was indoor/outdoor (red puffer jacket)
1 was indoor only in these temperatures -- denim jacket.
I wore the puffer under the coat sometimes, and over the denim jacket (with merino and other warm layers beneath). I used scarves. I had a hat and gloves with me.
This worked a charm. Mix and match.
On footwear:
- Blundstones for sure.
- ONE pair of sneakers (in case it it unseasonably warm).
- One pair of something else. High top sneakers would work, or another type of boot. You need something that will work if it does rain. Sneakers are okay in warm rain but in cold rain -- bleah!
On level of formality:
Yes, people dress casually these days. But, um, excuse me, don't you want to dress up? When I go to NYC I pull out the stops and wear some of my fancy things that I don't get to wear in my decidedly non-urban life here. If we go out for dinner, I'm wearing something nice! If we go to a show, I get dressed up. Not like I'm going to the opera or not like I'm on the champagne carpet -- but I wear a really dressy top, and nicer pants (or dress or skirt in summer). I wear dressier footwear (which maybe you will buy?!). And it is fun to do that.