Derek Lam 10 Crosby Tweed Jacket

Orig bought on RTR but is too small. I am so upset bc I LOVE this jacket/blazer. It’s in excellent condition. Perfect to dress w black pants and heels or booties OR with jeans!! Whitish/ivory tweed with navy & red sewn throughout. Collar, bottom and wrist bands all a dark blue denim. Size 4 but I feel it tuns a bit small. I’m usually a 4, and a 6 would’ve been better. Shoulder to hem: 18.5” Pit to pit: 16” Sleeve length from shoulder to wrist: 21.4