VTG 70s Midi Dress Sz 7/8 Retro Long Sleeve Floral Button Blue Pink Union

Discoloration/ stains on ends of sleeves (see photos). On small snag near buttons on chest are (see photos). Please review measurements as this is a vintage piece and I am unsure if the red tag is describing garment size. Also has belt loops but no original belt. Blue pink and purple Vintage Union Made 1970s Disco Dress Cottagecore Boarder print teacher church going out garden business day dress tea buttons high neck