McCall's 9401 vintage sewing pattern, dated 1998. 

Misses' Shirt, Pull-on Skirt and Pants:

Loose fitting shirt has collar, front button closure, optional patch pocket and side seam slits; pull-on skirt and pants have two rows of elastic at waistline and side seam pockets; skirt has a back slit.

Size LARGE 18 - 20:

Bust 40 - 42 Inches / 102 - 107 cm

Pattern is UNCUT and factory folded. Envelope is in good condition, with a store stamp and handwriting on the front.

More 90s patterns here:

https://allthepreciousthings.com.au/collections/1990s?page=1