Brownie Girl's Leggings, Brown, 20 inch

The size guide for legging and trousers aren't clear. What size would you rtecommend fopr an 8 years old?

Are these the new design?

What size will fit a tall 10yo, 146cm with smaller waist? These are to last the last 3 to 4 months of Brownies, so will not need much growing room.

When they say 26 inches where is this measurement from? Inside leg or waist to bottom of leg?