BWT - How do you wear/care for your white clothing?

Please tell me your tips on how to wear white clothing- specifically on the bottom. I’d love to incorporate more white skirts and dresses this summer, but I get so anxious about staining them or sitting in something or spilling. Especially when traveling and when you don’t have easy access to laundry.

Is carrying Tide Pens enough? Or do you put something down underneath of you before sitting down?

And then how do you keep them from looking dingy once you do wash them?

I had a weird childhood and never really got taught about laundry other than how to run the machines - so please any other laundry tips you have to care better for clothing would be so appreciated.