These trousers are from New Look, and so were probably marketed as "Elephant bell-legged 'flower power' huge pants", but they flare in a modest, boot-cut type of way.
You probably have a pair like this; everyone does. This design is the standard high-street flared ladies' jeans, and can be found in just about every shop you look in.
Sadly, these fell jeans apart after many years of use. They were, however, not hard to replace - see F24.
W=28, w=22, l=43: θF=2.54°, VF=1963 ml, C=0.12