For this Sinestro costume, you’ll need a Sinestro mask in order to pull off his look convincingly. If you want, you can include the Green Lantern ring and green gloves in your costume as well. Kids can also join in on the fun of wearing a Sinestro costume for kids too. If you’re opting for the DIY route in putting together your Sinestro costume, make sure that you have some good quality red body paint to paint your face with. If you have some mad makeup skills, you can go all out on this one! Be sure to draw in his moustache and his exaggerated eyebrows that point upwards towards the ends. Remember to always wear that strict expression on your face!