This EXO foto contains
gut gekleidete person, anzug, hosenanzug, and pantsuit.
There might also be
oberbekleidung, überkleidung, overclothes, geschäftsanzug, business-anzug, box mantel, kastenmantel, and box-mantel.
According to EXO profile, D.O speciality are Singen and beatbox. Chanyeol is well-known for his beatbox but I've never seen D.O beatbox. This is only the video to see D.O beatbox.