In the archives here I show a better example of how this done, we’ve made minor changes over the years, but essentially we steam the silks we design like this.
I usually roll up 8 silk scarves at a time, in a line, on a roll of newsprint. After they’ve been rolled up they are wrapped in heavier butcher paper, with lines of holes to allow the steam to come through and into the roll of silk.
The roll of silk is pierced at the top with a coat hanger. Then the hanger is bent in such a way that it fits snugly into the top of an old stove pipe. The pipe is positioned into a large pot with a couple of inches of water, care is taken to make sure not too much steam escapes and then I let it steam for 1 1/2 hours.