Description - Black high waisted panties from the 50s with nylon double mushroom gusset. There are sheer gathered inserts with lace trim on both legs. 

The newspaper advertisement I found for these is from 1959. 

Details

Brand - Pinehurst Lingerie

Content - All Nylon

Size - Labeled size 7 and are approximately a modern Medium-Large but please check all measurements to insure fit 

Waist - 12" across, stretches to 21" across

Hips - approximately 20" across, stretches to 23"

Rise - approximately 15" 

Leg Opening - 9.5" across, stretches to 12.5"

Outseam - 11"

Condition - Brand new with tag attached