Green’s Dictionary of Slang

trotty adj.

also trottie
[trot n.2 (2)]

of a person’s figure, small, dainty; of clothes neat, fashionable.

[UK] ‘’Arry and the [...] Lady Cyclists’ in Punch 15 June 285/3: ‘Divideds’ and ‘Knickers,’ my dysy, are sniffed at out Hislington way, / But when countesses mount ’em at Chelsea, they’re trotty and puffeck OK!