There are a number of things you can do to try to keep your skin in good condition and avoid symptom flares:
Use an unfragranced moisturiser as much as possible (no colours or perfumes) ideally twice daily if your skin is in good condition, and 4-6 times daily during a symptom flare
Use sensitive skin detergents in your washing machine
Wear loose cotton clothes as much as possible
Completely avoid soaps, shower gels and bubble baths
Stay well-hydrated