Actually, there are two men in street clothes in the background and the others are getting dressed in their protective garments. Notice the various instructions on how to dress, even the booties to wear are indicated on the "bench". I suppose that the protective clothing is for entering the pressurized module above the stairs.
Side note: I used to wear protective garments (all as here but gown instead of jumpsuit) to enter sterile rooms in hospitals. What is worn depends on how the contamination can be done, such as by direct contact only or in the air. Usually the garment is to protect ourselves, sometimes it is to protect the patient, and other times it is to protect both. Typically, the gown, mask and gloves are standard. The hat and booties are for special occasions, often to protect to patient. If I recall correctly, an example of two-way protection would be for a patient who has a transmittable disease that also diminishes his immune system.
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