undershirt
They are usually called wife beaters. They are called wife beaters.
I believe an undershirt (US) is known in the UK as a vest. Or is that a singlet (US)?
The Deep-V undershirt at Silverback Apparel is specifically designed for this purpose. It also brings the advantage of having sewn-in sweat barriers (second layer of fabric) to prevent underarm and back sweating
Skid marks.
That would be a tailor.
Undershirt.
It could be a sleeveless undershirt. It could also be a tank top. There may be other names for this garment in other cultures.
Undershirt?
Vest
You can call them as urban backpacks, they are comfortable with shoulder straps and even one at the waist. Additional padding is also provided for them.
an undershirt