I may have a few solutions for you.
I am pretty much going to send you to the asian shopping sites ( Aliexpress, Wish, DH Gate, banggood etc. ) you will just have to filter out the other frequencies and protocols/modes
So a sticker??
Just search for exactly that
But that might not be very robust for your gloves, but they do exist.
If you search for laundry tag, they are made for garments,probably a better choice
Something smaller than the fob that I would recommend is a wrist band, and cut the inner chip out, I have done the same, plastic casing, resin filled., Let me find a photo…
You could also go for glass pet tags, normally 134khz, but they do sell them in 125 and EMxxxx
You could buy 125khz Rings also
Also, they do pet tags… think bird leg tags, they will be worth a look
Of course not smaller, but would fit in a wallet easily is a card form factor…
Hope one of those suggestions help