The official suit of the Joker is the Silver Tonic Dress Suit by Ventuno 21 with contrast black marcella shawl collar and it is, unfortunately, discontinued. If you are very lucky there may be a few left in specialized stores (around $150).
You can also get this two piece suit, which is a pretty close match for cheap and nice quality.
If you are going for the promo look of the Joker you have to get all the details right.
These disposable purple latex gloves are durable and it is very likely they are the same Jared Leto used for the photoshoot.
Take one to two size over yours to get the same effect.