Request: Is this yuri? and what's the other flower?

[Ariane]

The biggest flower looks like yuri (lilies), but what about the small flower? Ume? If that was the case, don't these two flowers not match the same season?

[Tsubame]

the petals of the small flowers seems notched at the top, so I would say it's sakura, no ume.
Is this a yukata? If so, they often don't follow a strict seasonality, and feature more popular motifs like sakura (that are also considered all-season).
A trend also used is to see winter motifs to give a sense of coolness,

[Ariane]

It is a yukata, yes.
Thank you for the info, especially the one about winter motifs, you taught me something.