I am back home from my trip to Scandinavia (Sweden, Norway and Denmark). I am grateful to those of you who had generously contributed answers to my packing dilemmas before the trip. So in the spirit of giving back - here is my summary on the packing scores and mistakes, as well as some remarks on the street style I saw.

PACKING
Most of it is good - I had pretty much packed the right things, with perhaps a few tweaks to be had, but nothing major (phew). Following some excellent tips on this forum, I did end up taking a large variety of items.
A. Weather
So first of all: YES you do have to dress for 4 seasons, sometimes literally in one day. Just as I'd think that I shouldn't have brought a particular item as it's too cold/warm for it, the very next day would prove me wrong and I'd wear the item in question. Moral: pack a great variety of items for all sorts of weather!

It really felt warmer (in the cities) than the temperature would suggest - so if it was 22 degrees or above, I was in sandals with either cropped pants or skirt/dress, or sometimes a dress with my white sneakers, a combo which really felt right (see below). What exacerbated this was that most museums don't seem to have any air-conditioning, so it was incredibly hot inside buildings - and as a result once you got back on the street, you took a while to cool down. As a result - I did feel quite warm a lot of the time.

However, in Norway we encountered really cold weather on some days, where I had to wear a long trousers with a shirt+light sports jacket + softshell jacket with hood all at once.

B. What I packed and comments

City Sightseeing

• 1 pair long trousers

• 1 pair long jeggings

(Comment: could have done with just one of these - however when it was cold it was usually wet at the same time, so was glad to have a back-up)

• 2 cropped trousers

(Comment: could have done with 1 but it was nice to have variety)

• 1 knee-length tube skirt
• 1 casual dress

(Comment: thought I was packing these two "just in case" but they got heaps of wear!)

• 11 short-sleeve T-shirts

(Comment: had to have lots as we were changing accommodation about every 2 days, sometimes daily, so washing was too difficult except for a few places. Perhaps should have packed 1 more to go with the skirt, which I hadn't expected to wear as much. The only shirt that came back unworn was one made of polyester - it's actually quite a favourite one, but the fibre just seemed all wrong on a holiday).

• 4 cardigans

(Comment: I am a cardigan sort of person. 3 got heaps of wear, one didn't - interestingly it was the oldest one that I though was "tried and true" but in fact I felt quite tired of it and it didn't make me feel stylish. Each goes with a different combo and all were quite light. One was a long cardigan that I love but thought impractical for travel and a bit of an indulgence to bring... and it possibly got the most wear)

• Light pocketable rain jacket

(Comment: Bought this at Uniqlo just for the trip - loved that it was longer, sort of mid-thigh if not longer, and could be worn over everything else, including the softshell jacket. It was worn heaps and carried around in a backpack even more: a perfect travel item in summary)

• 3 light scarves

(I am a scarf kind of person and the mild days in Scandinavia were made for these - I basically wore one every day. As usual, I wore one more than the others because it was the most practical, being soft but not prone to wrinkling. Another was a disappointment as it wrinkles and there were no ironing facilities in the rooms, and in any case I would have hardly bothered. )

• 1 pair Ecco walking sandals

(Comment: worn a lot more than I'd have thought - I would have ended up very, very unhappy had I not packed them as my feet swell from walking around on a warm day)

• 1 pair Ecco white leather sneakers

(Comment: possibly the most worn item of the trip)

• 1 pair plain black Adidas runners

(Comment: I packed these as I still felt that the Ecco sneakers were untested when I came to 14-hour walking sprees, but hardly wore them as the Eccos totally proved themselves and looked a whole lot more stylish and current)

Gear for Norway

• 1 light sports jacket which can be worn as the bottom layer
• 1 warm softshell jacket with hood

(Comment: really debated over this one, as it takes up quite a bit of space. In the end was incredibly glad I had it as I wore it almost every day in Norway)

• Hiking boots

(Comment: for a whole lot of unforeseen reasons we ended up doing a less hiking than we'd thought. So I could have done without them... but who knew?)

• Leggings and hiking shorts

STREET STYLE
Most of this is based on Sweden - where we'd spent the most time. Plus - the fjords in Norway were all about gear, and Copenhagen was too eclectic and too full of visitors to really pick a style. Before I say anything about Swedish style, I should start by remarking that there were so many model-like physiques (height, figure) that any old sack would have looked good on most of them. But:...
1. Absence of brand consciousness: hardly saw anything with a label until I got on the plane back home and was reminded that, ah yes, people do carry labelled handbags and wear labelled sneakers. I suppose this is the essence of why Swedish style is often called "effortless style".
2. Loads of white leather sneakers everywhere - but plain white, not Stan Smiths or anything. Especially with dresses - in fact I hardly saw a dress that wasn't worn with sneaks - and then it was worn with Birkenstocks (of the Gizeh variety)
3. Light muted colours: light blues, whites and greys everywhere.If I was to pick one outfit that really was everywhere on the streets, it was light blue jeans, striped T-shirt (navy and white), white sneakers and light grey or light beige cardigan or jacket
4. A few striking exceptions were stylish women with very blonde hair dressed in summery head-to-toe black - which of course looked amazing
5. Flat shoes everywhere, as were looser fits, little obvious make-up - in short, practical and comfortable, the very opposite of the "Look at me" style
6. Sports-type clothing everywhere, and no, not just on tourists: sneakers reigned, lots of sports jackets - though not the whole head-to-toe "I'm on my way to the gym" look, the sneakers were usually worn with jeans or dresses.
7. And yes, there was an H&M on every corner

Thank you for bearing with me as this ended up a super long post! Please feel free to contribute or contradict if your experiences of Scandinavia were different...