Vintage very long dress

this dress is vintage never worn still has the tag on it. the sleeves are long but are split from the shoulder down to the wrist also has a split at the bottom for leg room hard to see in the pics because it's a black dress. pit to wrist is 19 inches pit to pit is 18 inches waist one way across is 18 inches full length from shoulder down is 58 inches The fabric is very very streachy, lightweight, soft and silky. zip up back. size M