It depends upon the type you choose. However, they are most comfortable as they come in light-weight fabric and elasticated waist. You can easily wear them as a costume or even underdresses (some varieties). However, choosing a good quality petticoat is necessary in this regard. Its fabric and making will decide where it will be comfortable or not. They generally come in one size fits all patterns. Many brands also offer different sizes. You can find smaller ones for kids.