Buoyancy Control Device (BCD)
Practice it works in
Also called the buoyancy compensator, this piece or wearable equipment is for divers.
Its specific use
This device is used for divers to achieve neutral buoyancy underwater and positivity buoyancy (float) on surface.
It is usually attached with an oxygen tank, diving regulators (1st, 2nd and alternate) and information system tools (compass/depth/pressure gauge).
Mobility
Is it fairly mobile, worn like a vest.
Comes in sizes as well.
The only part that inhibits its mobility is the size and weight of the oxygen tank when worn together.
Utility VS Fashionability
It is more for functionality than for fashionability as it is a very important piece of device in diving which involves delivering air supply to the diver and making sure the diver can stay afloat on surface.
In terms of fashionability, as it looks like a vest so different patterns or clothing ideas can also be applied to it as well. Although the right material would be more important.
Hairclip Multi Tool (Clippa)
Practice it works in
It can be used generally but Clippa Blackfin was specifically manufactured for military situations and purposes.
Its specific use
It is a general tool, combining many different tools:
1. Bottle opener
2. Screwdriver/Box opener
3. Nail file
4. Ruler
5. Serrated knife
All into one small and light tool that you can wear on your hair.
Mobility
It is extremely mobile, measuring a size of 5-6cm in length and extremely lightweight, weighing at 4.5g. Furthermore, it can be worn on your hair.
Utility VS Fashionability
Besides the Clippa Blackfin (marketed for men and military uses), there is also the Clippa Lady which is pink in colour, targeted at ladies. This shows there can be room for fashionability and it can be worn as a fashion statement. However the design would be hard to change as it has to incorporate all those tools.