My strategy forever is to wash all my shirts, put them in the dryer on low for 5 minutes, then hang them all up in a doorway overnight. My clothes last much longer this way and never get wrinkled.
or have any cracks for air to enter the door or doorjam,
that 90% relative humidity should be no problem!
(California is a notable exception.)
In places which are humid during winter-time, cracking a few windows open will allow for equalisation with the outside, again keeping indoor humidity reasonable.