Before I start I will say I’ve been through many fantastic threads on here in the last few days researching and I’m amazed at the wealth of knowledge in here , however I’ve not found my answers, hence my questions!

Ive been donated a goose down duvet for my first ever project of making a TQ.

The label states that the duvet has 1000g of fill...

Now before I go ahead and make myself crazy with sewing baffles etc , my questions are 2.
1. Will goose down be good enough ?
2. I’m in Sweden and look to manage in -15 /-20 Centigrade , am I assuming correctly a 3” high baffle will give me sufficient cover /warmth?

Cheers guys