In some versions yes, wool can stretch a little over time but usually, that stretch is lost once the wool is washed. The key will be in how dense the wool fibers are. A worsted wool material may not stretch at all as its fibers are very close together.

How do you make wool pants bigger?

Begin by soaking the wool in a bath of warm water and baby shampoo or hair conditioner, then take the wool out and gently stretch it manually to get it to its original dimensions. In less than twenty minutes your garment should be back to its normal size and look as good as new.

Does wool stretch or shrink over time?

Normally, soaking wool for this long is a no-no because it relaxes the fibers and makes them stretch. Of course, that's exactly what you're going for when you want to unshrink a sweater! Drain the soapy water from the sink. Unlike regular washings, refrain from rinsing the sweater with clean water.