I disagree about Le Creuset. I have one and it’s not been holding up well, also the whistle is so quiet I can barely hear it if I’m not in the kitchen.

If you’re looking at service boots (i.e. Thursday Captains) you could but White’s MPs, Grant Stone Diesels, etc. The most aesthetic service boots are Viberg’s IMO, also the originals (and quite pricey), but they are a Canadian brand (still probably easier to acquire in the US than the UK).

There are lots of good places. Saddleback uses cheap chrome tanned leather for everything, so their belts are pretty overpriced. Find vegetable tanned bridle leather and see if they advertise the thickness of the leather when trying to determine how good it will be. Here’s one example of a great belt from an individual leather worker: https://bweissleather.com/shop/ols/products/super-beast.

Also, you’ll never find a duvet that 1000 full power down. You wouldn’t want or need it anyways. 650-700 is fine for a duvet. What matters is how much down is used, you need a decent amount (weight) to be comfortable and well insulated.