@bike @robb Without any evidence or research I would surmise that ironing would not only smooth out wrinkles but soften the fabric and make it more comfortable (presuming no starch added) - makes sense if everything is line dried but if you use a dryer completely redundant?? Also remember all natural fabrics until quite recently.
@PedalHoppy @robb I pretty much wear all line-dried natural fabrics (no starch added) and the wrinkles usually come out within a few minutes of wear?