Is Pre-War Formalwear legal in Standard, Modern, and Commander?

Pre-War Formalwear is legal in: Legacy, Vintage, Commander.

Pre-War Formalwear

Q: What type of card is Pre-War Formalwear?

Pre-War Formalwear is an Artifact — Equipment. Its oracle text reads: "When this Equipment enters, return target creature card with mana value 3 or less from your graveyard to the battlefield and attach this Equipment to it. Equipped creature gets +2/+2 and has vigilance. Equip {3}"

Artifact — Equipment

When this Equipment enters, return target creature card with mana value 3 or less from your graveyard to the battlefield and attach this Equipment to it.

Equipped creature gets +2/+2 and has vigilance.

Equip