Is this the same fit as a regular Levi's 517?

No. The standard 517 is a bootcut with a lower rise. This version is high-waisted and cut wide through the leg, so expect a roomier, more relaxed silhouette.

Does the denim stretch?

No. It is 100% cotton with no elastane, so it feels stiff at first and loosens slightly with wear. Size for the waist you have rather than expecting it to stretch out.

How should I size these jeans?

Rigid cotton wide-leg jeans usually run true to waist size but roomy through the hip and thigh. If you are between sizes or want a closer fit, consider going down one waist size.

What is different from a standard Levi's wide-leg jean?

Mainly the high rise, the Valentino collaboration branding and the finish. The fabric is still plain cotton denim, so the premium is for the design and label, not the material.

How do I care for them?

Wash cold and inside out, and hang or lay flat to dry to limit shrinkage and fading. Avoid frequent washing to preserve the blue wash and the rigid hand feel.