So the pleating of the gold handmaiden is taking a lot of time, but it's worth it. When I started thinking about this dress I thought I was going to do proper box pleats and simply press them down. When I started to fiddle with the fabric I realized that I couldn't make them tiny enough though, so I had to come up with a different process.
Then spray the whole fabric with starch. I'm
using a strong start made from 1 table spoon potato starch and 150 ml of
water. Use a spray bottle and make sure that all the fabric on the iron
board is wet. Let the starch sink in for around 30 seconds-1 minute. Set
the iron to a fairly high setting, I'm using the silk setting, and
press the iron straight down to the fabric. Don't try to move the iron,
but simply lift it straight up and put it straight down for the next
section of the fabric. It really helps if you also try to use your hand
to stretch the fabric. Go with the iron all over the fabric until it's
dry, or at least almost dry.
Make sure that the fabric is left to dry completely flat, don't hang it.