I use decathlon's own brand stuff, size small. nice and snug

Excellant, nice and cheap as well i'd imagine.

Cut off ladies stockings will work fine, just don't ladder them.

sportful - the sizing goes down to teeny arm size.

I've just purchased these in medium [url= http://www.chainreactioncycles.com/Models.aspx?ModelID=32273 ]From CRC[/url]

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Sportful work pretty well, various thicknesses of armwarmer - from summer protection to superlight marmotte style protection to full on warm.
rapha are skinny too, always think I'm going to punch myself in the face putting them on, reflective stripe quite warm (with all important pink trim)
assos - much as rapha just with swiss writing and without the reflective stripe.

DHB ones work fine.
I guess most arm warmers are designed on the assumption that most cyclists have an anatomy similar to that of a T-Rex 🙂

[mental image of dinosaur on a bicycle]

One of the few that fit me well are Nike Roubaix armwarmers. Should still be able to find stock in some places.

My girl arms fit the small Endura ones, the only problem being they could be a bit longer!

I use leg warmers but they're a little long....

But rarely need em..

DeFeet armskins. I haven't tried every armwarmer on the market but of those I have they are by far the best fit and do not fall down. They don't rely upon grippers, the material is knitted and is a close fit all over - hence why they are such a secure fit.

I'll second the DeFeet recommendation, really good snug fit.

I caught some Endura ones in the throwout at SSUK and they fit perfectly, and I'm not blessed with chunky arms.