Please,


Image from: wikipedia

Walbaum  Suggested by donshottype 
Chapaza  Suggested by Healthy toast 

I know I´m pretty late, but if any random person is interested, the following fonts are fairly similar:

big "BOSS" font with serifs: https://www.dafont.com/de/chapaza.font?text=BOSS

smaller "HUGO BOSS" font without serifs: https://www.dafont.com/de/made-evolve-sans.font?text=HUGO+BOSS&back=theme

Hope that helped!

Custom, but based mainly on the _S_, probably inspired by a display weight of Walbaum or one of its descendants.
BOSS is a German luxury fashion house, so the use of a German typeface as a source of its logo is logical.