Chester -
As needed I tie dries down to size 24; I keep a small box stocked with a variety of 18 to 24s - a small box holds a lot of them though one needs to be careful opening up the box on a windy day.

During the mid 1990s I would visit my son in Wisconsin to fish the spring creeks in SW part of the State. Great fun and by mid-summer a number of species of mays,caddis and midges would hatch daily with a size 18 being huge, 22 to 24 the norm and some where a 28 (the smallest I ever tied) would have been too big. Those heavily pressured fish really zeroed in on the smaller bugs. Often rather than trying to match the hatch we fished hoppers and crickets though even there size 14 hoppers were much more readily accepted than full size bugs.

Tight lines
Curt