Hey, I'm just wondering. What is the bathroom situation like in their household? you know like showers, sinks, toilets
Considering the unified universe, there's a "domina sized", most common in Domina's Valley, of course, where stuff comes in sizes about 50% bigger than normal, so, you would get appliances and other things in a bigger size, this covers most stuff in their life.
It is also common pairs of toilets with different sizes.
Otherwise, stuff is custom made, and if you're a giantess, or you know people who makes customs, like Tony does, or you're rich. Or you live in Domina's Valley where a big part of the population is bigger than average...