If your son is tall or broad-shouldered, you can take 2 sizes up as he is a bit narrow. For my son I usually take jackets in size 16, he is ok in size 14 but has broad shoulders. I bought him a size 18, fits like a size 15 (if available).
Red SOLOCOTE Windproof Outwear for Boys Ages 7-8 - Heavyweight SW18018
54 Review
Waterproof Hooded Rain Jacket for Kids - Lightweight Fleece Lined Coat for Boys and Girls - Windbreaker Raincoat
64 Review
Maoo Garden Winter Quilted Boys' Clothing and Jackets & Coats: Stay Warm in Style
54 Review
π§₯ JAN JUL Boys' Waterproof Fleece Lined Cozy Dry Clothing, Jackets, and Coats
58 Review
Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review
π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
47 Review