Hi, Karen
Your posts are funny & enjoyable!!! :app:
If you don't think layering under your windbreaker and wearing knit hat & gloves will keep you warm enough, bring the ski jacket but ditch the raincoats. Does your windbreaker have a hood for rain? If not, I read there's an umbrella in the suite.
DH & I will be doing Alaska the week after you. We plan to bring our light Goretex parkas with hoods for visiting glaciers & while viewing on deck ('cos living in sunny CA has thinned our blood!), and windbreakers with hideaway hoods for general wear. We'll also bring a little travel umbrella for when it pours.