Interesting subject, Carla. I look forward to reading other forum members' comments and hope you will tell us a bit about your own experiences and/or plans.
Here are my answers to your questions:
No, I don't have or want clothes I use only when travelling.
I usually don't shop for clothing items before going on a trip. But of course, if I have a specific need, I will do so.
I sometimes shop while travelling-- if I see something I like and can afford it. It's seldom for needs while I am away, though.
My style is casual elegant and a little playful--also when I travel. I guess some might think I look dressed up, while others might think I dress look dressed down. I am simply myself and choose what feels natural to me. Compared to my work outfits, my travel outfits are dressed down. However, contrary to many others, who seem to always travel in jeans or leggings, I sometimes travel in nice pants/trousers, a skirt or even a dress. My outfit has to be comfortable, though.
I mostly travel by bus, sometimes by car and sometimes by plane. I might be a bit more dressed up when going by public transportation than by going by personal car. But my packing practices don't change much. Well, for a trip by car I might choose to pack in two soft bags instead of one hard suitcase. The actual content of the bags/suitcase will depend on the planned activities at my destinations. Nevertheless, there are items I want to bring practically anywhere I go. Among these are: ballet flats, shawl, and cardigan.
I am not sure whether travel affects the curating of my closet. Would probably organize things the same way if I was going to stay home for a long time. However, for many years I have had to travel at least every other weekend, in addition to some longer travels each year, and I prefer clothing items that can be used for several purposes and styled in a variety of ways. My clothes are stored by categories (dresses, skirts, pant, jeans, blouses, buttonfront shirts, turtlenecks, crewnecks, shawls / big scarves, smaller scarves, etc. etc.), so it's easy to find items I am looking for. Generally, my closet contains only items which are fairly clean and ironed and doesn't need repair. I do laundry about once a week. Items needing ironing, repair or new buttons are kept in a small separate zone of my closet, so I can still easily see them and, if I want to bring any of them, manage to take action one or two days before I go.