Obviously you can't press velvet or the nap will compress, and some synthetic velvets I'm even afraid to steam, because the heat of a steam iron will sometimes cause rayon or acetate to shrink, fade or contort.
If you have some flat spots in your velvet, try this.
Get a household mister bottle full of clean water. We have a simple spray bottle I bought at the grocery store for $2; it has an adjustable nozzle so I can either squirt the cat with a fast stream, or spray a light mist over my ironing.
You will also need a fabric brush. Again, not anything new, but the first one I saw was like a revelation. It's a device shaped like a paddle hairbrush or a hand-mirror; skinny handle with a swollen flat head. On both sides of the head are circles of fabric with a stiff directional nap--it feels a little like the velvet itself, but rougher. You can find fabric brushes in the grocery store or big-box store, near the ironing boards and other laundry care items. They are also good for taking pet hair and lint off your clothes.
- Hang up your velvet piece.
- Mist the flat area with water.
- Brush the nap in multiple directions with the fabric brush until the flattened nap stands up in line with its surroundings.
- Let hang until dry.
That's it! If it's really stubborn you can try applying careful steam (only to warm the fabric,) then mist and brush.