I ordered this bolero in a custom size for longer sleeves (ah, tall people problems~)
The fabric is a very soft and light cotton jersey, I imagine it would be comfortable even in summer. Ruffles are neatly serged at the edges. There is lace trim applied over the ruffle gathers at the cuffs and collar. There are bust and back darts to improve the fit.
I am very happy with the final product, especially with the quality of the re-tailoring.