balletballet says:

Classic Black jazz pants. Perfect with any leotard for a modern look. 

Manufacturer says:

1st Position garment made in the UK
Best Seller! Comfortable and versatile classic jazz pants with elasticated waistband
Popular choice, a must for school and exam wear
Jazz pants are supplied un-hemmed
Fabric: 80% Nylon/ 20% Elastane

Keep away from fire. Do not wear for long periods of time as costume is designed as dancewear.