There is no extra customs tax for Australia as I noticed from numerous purchases.
When picking the color of the dresses, I strongly advise to purchase the fabric swatches available here as it ensures that it will look the way you want it to be.
I ordered 4 dresses and a mob dress and it came inside a small box, which i initially thought could not possibly accomodate 5 dresses. Upon opening it, the dresses were neatly packaged in a zip lock bag. The dresses were turned inside out to ensure no damage to the external part.
The dresses are very good quality, well constructed. no fraying, sewing are pretty straight, it can easily look like I paid $400 due to the quality.
The skirt is very thick and full volume that you do not need a petticoat.
The colour is vibrant and I'm just super happy with my purchase. Especially when my nieces tried them on, seeing their faces light up is priceless!
Size wise they are in the bigger side, I chose a size 4 for my niece who is a petite 3yr old thinking they will still grow, I should have choosen a size 3 for her. All my dresses needs a little alteration due to the presumption that kids will grow. The length ended up floor length which I actually liked as it looked more formal.
My suggestion is to order the dresses 3-4months before the big day to ensure good fitting