I bet you could do a refashion similar to this with an oversized T-shirt; use pin tucks for the welts… Or even use blizzard fleece to layer over long sleeves and tights.
simple summer dress, kind of a pillow case dress, pattern I want to do one in maxi version - moldes moda por medida
Tutorial and free pattern - Sorbetto Top from Coletterie (ex-Colette Patterns). It's not very fitted but it looks nice anyway. Also there's a free sleeve pattern at The Sew Weekly.
English Tutor Dress - pattern from adaptations to Simplicity 2473