Vinyl and wet look run small. Coated fabrics have no stretch whatsoever, so size up on anything vinyl, patent or wet look. Elastic strapping, mesh and fishnet all have real give, so stay true to size on those. This is the single most common sizing mistake in the category.
Adjustable strapping is the entire point. The good pieces have sliders at every junction, which means one piece fits a wide range of torso lengths and keeps fitting. Fixed strapping is cut for exactly one body, and there is no adjusting it after it arrives.
Judge the hardware before the fabric. Metal O-rings and sliders hold up for years. Plastic ones snap, usually at the worst possible moment. You can spot the difference in a product photo, and it tells you more about how long a piece will last than the price does.
Open cup means pasties. Anything cut away at the bust needs them to be wearable anywhere but a bedroom. They cost less than anything else in this collection and they change what a set can be worn to.
Wet look and vinyl do not breathe. Excellent for an hour, a photoshoot or a club. Less excellent for a whole night. If you want something you can actually stay in, strapping and mesh wear far longer.
Hand wash, and never wring vinyl. Twisting cracks the coating and the cracks do not come back out. Cold water, gentle soap, lay flat. Heat destroys elastic strapping just as fast.
This is lingerie, not equipment. Nothing here is rated to hold weight or restrain a person, and using it that way is how straps tear. If restraint is what you are after, cuffs, rope and restraints are a different and much safer purchase.