Here is a hard to find pattern from McCall's Evening Elegance collection - Pattern #3853 Gown (Prom or Wedding Dress with separate Top and Skirt Sizes 16 18, 20 and 22.
This is an UNCUT pattern with the instructions and pattern still factory folded. Envelope shows some shelf wear that doesn't effect the pattern.
MISSES’ LINED TOPS AND SKIRTS: Close fitting lined tops A thru D have boning, front detail variations and back zipper closure; top A and B has front lacing variations; top B has shoulder straps; top D has neck strap; top C and D have frog closure; skirt E and F have back zipper closure, front seaming and waistband; skirt E has flat waist; skirt F has attached overskirt gathered into waistband.
Size 16 ~ Bust 38" Waist 30" Hip 40"
Size 18 ~ Bust 40" Waist 32" Hip 42"
Size 20 ~ Bust 42" Waist 34" Hip 44"
Size 22 ~ Bust 44" Waist 37" Hip 46"