Hi Donna!
Looks to me that you have everything you need (and more!)
I have no experience of Caminos in Spain in Winter but... I have walked (continuously) from July to December, passing through Bulgaria, Serbia, Turkey....Everything from 35 + temperatures to minus ones, rain, wind and snow.
This is what I took: (all in 'tech-y' fabric)
- 'silky' camisole, (that very thin layer made all the difference I think)
- 2 short-sleeved T-shirts
- 2 short-sleeved shirts (just to look less 'pilgrimmy' in the evenings lol)
- 1 pair very light long trousers
-1 Macabi skirt
- running shorts (also served as sleeping gear combined with the camisole)
- 1 zipped fleece
- 1 wind-breaker jacket (very light and only showerproof)
- 1 poncho.
Once in Vienna my husband brought me my merino leggings and a merino jumper. Couldn't have done without it, even slept in them in cold countries...
Sun hat (also protects from the rain), buff (invaluable! Protects your ears from the cold too).
I bought wolly glooves in a market on the way.
I bought thicker walking trousers once in Sofia, didn't find a proper rainproof jacket but perfectly managed without.
I also bought more outer socks (I think I started with 3 pairs) as they took a loooooong time to dry.
It doesn't seem much but I never needed anything more even in harsh(ish) weather.
Hope it helps?
Enjoy your preparations