Ryoko Cursed battle axe outfit is missing in her CG and elly cowgirl is also missing

For Ryoko, you must be missing one of her old events: https://renryuu.miraheze.org/wiki/Ryoko#Character_events_sequence

In Elly's case, the outfit was introduced in the recent update and shows the outfit during her events in the time skip phase: https://renryuu.miraheze.org/wiki/Elly#Character_events_sequence