My answer is “between 1973-1975” and here’s why.
I’d have to say that for ordinary women (not movie stars or state officials at official functions) wearing gloves- from what photos tell me and what I remember- and here’s some rationale – roughly correlates to the time when women (by and large) started wearing pants: eg jeans or casual slacks for everyday, more pantsuits or dress slacks for work- and at that same time (and here’s the goves-correlate I think) – stopped wearing previously mandatory or standard ‘foundational undergarments’. I think foundational undergarments and etc themselves and when we stopped ALWAYS wearing the mandatory girdle- correlates to the invention of mass-market pantyhose. But I think the death of gloving more strongly correlates to the emergence of pants as acceptable and even standard formal for work. I think wearing gloves to work long preceeds the mid 80’s (ish?) when even pantyhose fell off workplace dress codes.I’ve seldom, if ever seen a non-military woman in the early 70’s IN pants or a slacks-based work suit, wearing gloves. That was also when my mother switched to the ‘slacks’ option as a Girl Scout Leader (GirlScouts is a good index for formal mandatory ‘proper women’ wear. Not ultra-conservative, but just – what any religion or culture followed for ‘how to raise or be a responsible girl or woman in society’.) I think she carried gloves with her slacks uniform ‘just in case’ but wore them ONLY during the ‘flag procession’ (you always wear gloves carrying a flagpole- it’s a ceremonial but also a practical glove-use.) She always wore dresses to formal occasions but that’s around the time (73-75) when suddenly that entire drawerful of blandly coloured ace-bandage-grade ‘girdles’, and the stopped getting opened. Women didn’t have to put on a big ugly bra and giant tight girl to cram into a dress – just to go to the store. Trousers were fashionable and smart, jeans were still for ‘the country’ or etc, but pedal pushers, comfy cotton trou- you could run the to the store or pick the kids up from school without bulking into a dress and making sure to choose some nice gloves. After that the women in ‘pants AND gloves’ seems to be confined to military and equestrian pursuits, or specialty events among Hollywood or higher society.
You just don’t see a lot of women wearing gloves with slacks- my mother abandoned the girdle and heavy ‘girdle-bra’ and foundational undergarment at roughly the same time she abandoned the glove draw, and while she was a slacks early-adopter (as ordinary housewives go) by 1975, it’s hard to find even ordinary-people wedding photos, where MOST of the women are wearing gloves- even though they are all or almost all, in dresses and otherwise ‘formalwear’. I take it were are not discussing what Hollywood, or state functions or royalty does on ceremony. I’d say- look at your family photos or shots. Up with pants, down with (girdles and) gloves- regional variations but nationally and internationally- about ’73-75.