Do you like them to start right from the door or ease into it after a consultation? Unless the situation called for it to be otherwise, I'd answer the door in causal clothing and have a talk with my client to go back over interests, previous experiences, ect. in person. I thought he'd be relaxed and likely to speak more freely that way. Then, I'd instruct him to be naked and on his knees when I came back into the room. The stark differences of not only my attire but persona when I re-entered the room, usually started the sub space.
In contrast, whenever Jean Bardot was doing a guest appearance at my space, she would answer the door in head to toe attire and full intimidation mode. The men would just melt. So, I can see the benefit of each approach. What has your experience been?