From Wiktionary, the free dictionary
From tunic + -wise.
tunicwise (not comparable)
- (rare) In the style of a tunic.
1922, Evangeline Wilbour Blashfield, Manon Phlipon Roland: early years:Her classic robe is folded tunicwise over the bosom, her dense hair falls loosely on her shoulders and is cut square across the brow.