There's nothing worse than a droopy swimsuit at the beach. That lack of elasticity can come from chlorine or salt water, but it can also come from your dryer. The heat from the dryer wears down the fibers of the material, making them limp instead of stretchy. This is another item that should be air-dried.
Your bra shouldn't go in the washer or the dryer if it has underwire or padded cups. The wiring and padding can get warped by oscillating with other items. Skip the dryer for any bra, though. Just like with swimsuits, the elastic can wear out quickly because of the heat.
I feel like I shouldn't need to say this, but I think I better... just in case. Even though you can wash Legos and other toys in mesh bags in the washing machine, that doesn't mean you can quick-dry them in the dryer. There's no water in a dryer to cushion them. The tumbling of the dryer could break the toys and they could dent the inside of your machine.
The metal hooks on overalls can beat the drum of your dryer and leave dents. The best way I've found to dry overalls is to throw the straps over a clothes line and buckle them. No indentations from clothes pins on the straps and they dry wrinkle-free.
The heat can also wear down any glue used to hold on rhinestones, glitter and other embellishments. Even if you use no heat, the tumbling around in the dryer can bend and warp decor. It's best just to let these items air dry.
There's a debate among jean lovers whether you should toss your blues in the dryer or not. Some give an outright no on the topic, since the heat from the dryer can wear down cotton. Plus, leaving jeans too long in the dryer can make them shrink.
Others, like Good Housekeeping, say drying jeans in the dryer is OK, as long as you take them out while they're still damp and don't see a lot of lint from your jeans in the dryer filter.