Être dans le champ de patates (expr.) : être dans l'erreur, se tromper : c'est pas demain sa fête, t'es dans le champ de patates ! Being incorrect about something, making a mistake. A similar expression to this in English would be, "you're out to lunch!". You get the jist.
Take the cold seasons in style with this premium crew neck sweatshirt. We made sure this wonderful sweater was available in multiple colors, just in case you wanted more than one! This sweater features fleece fabric and has a tight-knit construction to give it a higher quality feel and added durability.