Some providers will answer the door in their robe, bra and panties, or just a towel. I am curious to find out, when a provider knockso n the door for an outcall, how would you react if the hobbiest is wearing just his underwear, a towel or completely nude?

I would probably think it was sexy....or scary!
Could go either way

In all cases, I met the lady downstairs for drinks first before going up to my room, so I would dress accordingly.  Never would I meet a lady at my room door in skivvies, reagrdless of how the ladies are dressed when wecoming you their incall...

Depending on the hobbyist... it lets me know he's 'comfortable' already, which is a good sign (to me)

...not to mention the time saved without having to remove unnecessary clothing.

It does allow one to 'get down to the nitty gritty' quicker, which is rarely a bad thing, IMO.  

I believe in a modicum of dress to greet my visitors.

One exception is a certain favorite whose MO is to start tearing off my clothes before the door even closes.  For her I remove the belt and undo the fasteners and buttons first.

I got tired of the tailor bills.

When I have a new girl over for an out call I always  answer the door fully dressed. Honestly, to do otherwise would be a bit presumptuous to my way of thinking.  With my ATF it's another story. When we do out call she texts me when she is on her way up to the room and I unlatch the door so that she doesn't have to knock.  Depending on the mood I may be in boxers and a shirt (she likes to unbutton the shirt) or nekkid under the covers...

Last winter I surprised her by getting a room with a jacuzzi. When she entered the room I was already in the tub waiting for her...

I think it might creep a new lady out to answer the door indeknude.

have the tailor sew in some velcro rip-aways!

Nice!

A skinny old guy, with long hair and a beard, naked and cackling, chasing her across a hotel room with a can of Redi-Whip.

I think I'll answer the door wearing some slacks and a nice sport shirt. She can figure out that I'm a screwball for herself.

Like others have said - they already know the lady or she is clued in on what's going to happen - so that type of scenario is OK.

Me??  For the few outcalls Ive ever done - and most were when meeting someone new - I like to do the slacks & shirt thing.  But I like to not wear shoes & maybe no socks.  I'm in my hotel room, so I might as well be comfortable.

And I do hate that interlude where I gotta un-tie the laces & slip everything off - when I'd rather have other things happening!!  Nothing easier than slipping off some slacks when no shoes are involved!!

For sure, don't mimic that!