Since you are tall and weigh less, I recommend you to choose size L for this Standard Fit Regular Cut Crew Neck Black Knitwear Sweater. Size M may be short on you, especially in sleeve length and length. Size L will provide a more comfortable use. Standard fit - it will give you a nice, close-to-body look since it's a regular fit, it won't be too baggy. Additionally, since it is a mixture of 50% cotton and 50% acrylic, the possibility of shrinkage after washing should also be considered. We wish you pleasant shopping.