We recommend spot cleaning your garments when you can, then when needed, machine wash cool and hang dry. Your garments are preshrunk, so if you throw them in the dryer on low-medium heat, that's fine. They will shrink back up slightly but then loosen again once you put them on.
Garments can feel a little stiff after line-drying but once you put them on, your body heat will soften them right up. If you prefer, you can through the line-dried items in the dryer with a damp towel for 5-10 min to soften.