Close-fitting pants that should fit an SD Male doll with the following measurements:
Chest Circumference: 25cm
Arm Length: 17cm
Hips Circumference: 23cm
You may need to adjust the pattern for your individual doll.
(You can do so by creating a muslin pattern using this pattern and adjusting it.)
(DeviantArt may have resized the pattern but you can find a full size pattern here: [link]
You can buy doll accessories and clothing that I've made at my Etsy Store:[link]