Where can I buy winter clothes for Europe trip in Mumbai?

Hello, people. In the month of January I will be going to Europe, staying there at least for two weeks. I never went to any cold place and never experienced negative temperatures, so I basically need to shop for everything. But, Im at a loss here trying to figure out what is necessary and what is overkill. I will be dealing with temperatures between -5 and 10 celsius, and snow probably. It would be really helpful if you could give me some sugestions of brands and places to buy winter clothes in Mumbai. I heard Columbia is good but it’s a bit expensive, any other recommendation? Would love if you can share the details of products Thanks.