I am surprised to hear that Marigold rubber gloves are nettle-proof, I just hadn't really thought of them like that. I am wondering whether there is any difference in the age or size of nettle one is trying to grasp, or how one is grabbing it. I don't imagine that there is much difference in strength between old and new silica needles, but there seem to be far more on the upper leafy parts than on the lower stems. If one is collecting for greens vs string, is there a difference?
While "standard garden gloves from a garden centre" leaves me no wiser as to what kind of gloves the OP got stung through I am wondering whether they were just some kind of woven material, no rubber dip or leather. I think my mum once had some canvas garden gloves, but I haven't seen anything like that for decades. Were stings through the backs, or through the palms/fingers? The Showa 308 grippers that I like are thick knit on the backs, probably fine for a brush against a nettle but I would be careful if I was hand sifting nettles. Wouldn't want too much contact on the backs.
Bet there are some "heavy Duty" rubber gloves in the super market that would do the job, and give protection on the wrists.