I never hide things I've bought unless specifically presents for DH.
And if I felt I had to hide deliveries - as PPs have said - that would suggest something was wrong, and either he was controlling, or I was spending more than I should be.
But I also don't need to get permission to buy anything, and it would be a dealbreaker for me if a partner wanted to police how I spent my own money.
We discuss and agree big buys for the house together - not least because we usually will both need to top up the joint account to fund them, as we only pay in what's needed to cover bills, savings, mortgage and everyday spending. Also - because if buying e.g. a new sofa then we should probably both like it.
Small and medium size stuff people just buy from the joint with no need to discuss. Anything for the toddler or food shops or family / friends presents we just pop on the joint without discussing also.
I will often discuss my personal spending with him because I want his opinion.. e.g. I'm considering these shoes, do you think they're nice? Or which colour handbag? Or what do you think of this necklace? Or whatever. He's got good taste and he's interested in that stuff.
In the past if I've said is it a bit expensive (or whatever) he's likely to say "treat yourself, you deserve it" or similar so there's no restrictions or eye rolling in that arena.
I also will often tell him if I've bought myself something because I'm excited, so he knows when parcels are coming and what's in them. But that's just sharing in life I think.
This is long-winded, but I think my overall view is that if you specifically have to hide spending, then that suggests something is not quite right either in terms of communication or control, and I think it's telling that a few PPs have said they hide spending because their partners are controlling. The word hiding specifically invokes a sense of fear of being found out.
I also think it is important that people who are married (and therefore financially linked in terms of Credit Reference Agencies) are able to be transparent about their finances, and compromise on shared spending and savings goals, otherwise it's a recipe for disaster / resentment