Of course they have to be disassembled. This is sewn together for transportation. If the trademark is not disassembled, it is even more outdated.

The pockets of the suit can be detached or not, as long as There is no obvious difference between the color of the sealing line and the color of the suit

Don’t expose the collar of your underwear to the collar of your shirt. Wear dark socks. Don’t tie your tie too short. That’s about it