I have several Aussiebum suits:
viewtopic.php?f=1&t=137973&p=219407&sid ... 27#p219407.
Waist sizing and quality are very consistent. I wear an XS with a normal waist size of 28".
Of them, Swish in navy color (they call it "regatta") is easily my favorite (my wife's favorite too). A much more conservative suit than the other Aussiebums. They have an inner liner, front and back, and a small hole in the liner on each side at the seam to let any sand, etc. escape. Plenty of room in the front for your parts, unlike most other suits. Has held up very well so far with surfing and swimming at the beach. At my wife's suggestion, I bought another in red, but have not worn it yet.
Second favorite is the Wonderjock Precision Machete. The wonderjock part took some figuring out, since all of my parts don't fit in the front pouch where they are intended to be, so I put the balls in the inside pouch, and the rest in the outer pouch. Either way, it didn't make anything show off, but did a better job at keeping everything where I left it. I like to wear these for running on the beach.
The WJ Loose was.... loose. I can tie the knot on the nylon drawstring tight as I can, but it slips and then feels like it wants to come off. Its also a bit transparent when wet. I have only worn it a few times, outside the country on nude / semi-nude beaches.
The classic 1.5" sat uncomfortably high on my waist. Unfortunately, it was not worth returning. Bought another suit on sale, Five 'o and had the same problem. Your mileage may vary. This is the only inconsistent thing I have found with Aussiebum. Sometimes they sit high, and sometimes they sit low.