In many homes, near bathrooms, in same bathroom or next to washing machine, they have heavy duty laundry basket of clothes that serve to store dirty clothes in them so that everything is in one place and, at time to start washing machine, you can take laundry without having to go room by room. In places where there are several toilets are often placed clothes baskets in them so that each one finishes his and then takes it to laundry if it is quite ample. Or you have a large laundry basket in an intermediate place to fill it with clothes (there may even be two or else there is a division in it for white clothes and colored clothes).
baskets of clothes have their origin in fishermen. If you look, fishermen once needed something that would keep alive fish they fished. But, at same time, they could not escape from where they got them. This was how baskets came up because they put fish caught in them and put them in water. Just a little, enough for water to enter and keep them alive. But there was no way they would escape except that heavy duty laundry basket was broke somewhere.
That way they could conserve much more fresh and better fish and greatly improved quality of it. In case of clothing is something similar, it is about keeping dirty clothes in a place without. In principle, have to smell too much (unless clothes have too much smell). Nowadays you have in market many types of clothes baskets that combine perfectly with designs of bathrooms. We cannot tell you that there is a predilection for one or other because there really is not one. Keep in mind that, in most cases, bathrooms try to decorate in a minimalist way. And baskets of clothing have to preserve that spirit to balance bathroom well.
In terms of measures, there are several measures available depending on how many members form house. You will not find any measure since baskets too large are usually not easy to find or even will not be entirely well design. But a heavy duty laundry basket for four or five people yes is easier to find. Then you would have possibility to buy a couple of baskets of clothing to get all your family. Or to divide clothes in both color and white clothes. And put washing machine faster without having to separate white clothes from color once you have it all prepared.