Sally, you can wear your own underwear, but the larger pad would make them very buly and leakage could end up staining what you have,

Here in Oz you can get stretch panties to go over the pads. The panties are machine washable but if they get too soiled, you simply toss them out. Not sure how many you get in a pack, about 10 I guess.

Here's a picture of this particular type, but there are lots more available you could look at.

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