When we first married 40 years ago, my wife and I came up with what - for us - was the perfect solution to such things.
We agreed that each of us could spend up to $100 at a time without having to seek the other's approval, either before or after the purchase. The only caveat was that the $100 limit had to completely cover the cost of the item(s) plus delivery; none of this "buying it in pieces" stuff. It could take a long time to get a new car or bass boat that way.
Over the years, and as circumstances allowed, this amount was raised periodically. All of Nunatak is now well within my reach.
My wife did recently request that I reign in my SteepandCheap purchases on her behalf, as between her and our daughter, they now have almost as much Icebreaker merino wool clothing as does the local Icebreaker outlet store.
I see nothing wrong with this, as my gear closet looks like a REI satellite store. I ask you, fellow backpackers - am I missing something here?