Silk is a static-ish beast. It loves the static. Wool is also a static friend. So there may be some truth there.

Also, I'd be thinking about the linen, and where it was worn (climate and whatnot - wool probably being an easy beastie to find and tame and use for all manner of undergarments) and also about the way it's been woven and treated and whatnot; I find that linen has less give than almost anything else, when I'm spinning it, so it seems a little odd that it would stretch *so* much. But at the same time, wool has memory, so doesn't stretch like plant fibres, and would provide a better fitting thing that doesn't need taking in all the time, becaue it will take itself in.

I approach this entirely from a fibre-geek angle, of course, so I don't know all manner of period things.