Local conditions
Queensland rooms are taller and brighter than the fabric expects
Long Drops And Hard Light
Houses here run to high ceilings, stacker doors and glass that goes most of the way up the wall. That is lovely to live in and unkind to curtains: a long drop shows every millimetre of a crooked track, and a pale fabric in this light will fade on the leading edge if it spends four summers in the western sun.
So we specify for the aspect. North and east rooms take almost anything. West-facing glass wants a fabric with some UV tolerance and, honestly, something outside the window doing the real work — the Your Home guidance on glazing explains why the glass matters more than the cloth.
The other Queensland detail is stack space. A wide opening with a curtain either side loses a surprising amount of glass to the stacked fabric. On a stacker door we will often run the track past the frame onto the wall so the curtain clears the glass entirely when it is open. That decision is made at the measure or not at all.