People don't just suddenly grow tails overnight, you decide to find something to hide your new appendage. You throw open the closets provided by the hotel and...
"Whoa..."
'Pants and shirts... Coats... Shorts... Skirts... Dresses... Bras and panties... There's even a bridle and harness...' You can't help but reach out a hand and grope one of the bras, nursing your developing mammaries unconsciously in comparison. The texture is plush and soft, warm to the touch - Would they feel as nice and comfortable if you put them on? How would those panties fit you? Feeling flustered at the suggestive idea of trying them on, you try to ignore the passionate fire that's starting to burn within you and shift your attention elsewhere. 'They... Uh... Really have a lot of clothes here...
You sort through clothes with a bright red face, and despite the large selection there's no proper clothing that can cover the tail up. Most of them are tailored to fit you warm and nicely, hugging your form so perfectly that there's no extra length or baggy fabric to hide your tail underneath. Even the body-emcompassing coats are designed with swallow-tails that split all the way up to your tail for it to show itself proudly for all to see - the exact opposite of what you need. The only clothes that can hide your tail seem to be the women's clothing, but you think you shouldn't be trying those, not yet.
You could try something else, tucking the tail away under a string or belt but it's going to leave a rather noticeable lump sticking out. There's also wearing your own wet clothes, cold and damp from your escapade yesterday but baggy and loose enough to hide the tail without issue. Unless you wish to show your tail off in public and pretend it's a fake or just straight up hide in your room, those are your only options so far...