Moving to Seattle at the end of November. What essential items should I bring with me?

Hey Folks, I'm super excited to be moving to Seattle at the end of November from India. However, I've never experienced a real winter before as my current place has tropical weather year round. I'm not sure what all I need to pack to stay warm and dry.

I know I'll need a proper winter coat, but I'm completely clueless about what material, insulation, waterproofing etc. I should look for. Same goes for sweaters, thermals, socks and boots. Can you experienced Seattle folks guide me on what specific winter gear is an absolute must? Also, any tips on handling the rain, snow and cold in general would be much appreciated. Things like umbrellas, moisture wicking base layers, hot packs etc.

I'd be bringing most of my stuff from India, so please let me know if there are any winter essentials that are better quality/cheaper to purchase once I reach Seattle.

Thanks in advance for all your Pacific Northwestern wisdom! I can't wait to experience my first real winter.