31 cm is the M coat’s sleeve measurement; the arm-length check belongs to the grey inner top, whose sleeves measure 63 cm. That distinction matters when ordering this Demon Lord Rimuru costume: the black outer sleeves and grey inner sleeves have different jobs. Measuring only the coat could send you toward the wrong conclusion about how the outfit will fit your arms.
Rimuru’s authority, drawn in yellow
Yellow trim gives the black coat a readable edge, outlining the outer layer around the grey clothing beneath. The palette stays restrained, but it has a clear hierarchy: black establishes the long silhouette, yellow defines its borders, and grey supplies the central contrast. The black fur neckerchief concentrates another character detail near the face.
This is Rimuru Tempest’s Demon Lord outfit from That Time I Got Reincarnated as a Slime. Its long coat creates a more commanding impression than his casual navy vest appearance. A straightforward standing pose lets that change in wardrobe register without requiring an elaborate scene or a large prop.
Six components behind the black-coat silhouette
The Demon Lord Rimuru Set costs $82.99 and includes the coat, inner top, trousers, wrist guards, belt and neckerchief. The grey sleeves belong to that separate inner top, while the wrist guards add detail farther down the arms. Keeping those layers distinct is part of understanding how the costume is assembled.
The listed material is uniform fabric with spandex. A wig and shoes are excluded, so leave room for both in your outfit planning. Pale blue hair can establish Rimuru’s familiar appearance above the dark neckline; that remains a separate addition to the clothing purchase.
Read the inner top alongside the coat
All seven sizes—XS, S, M, L, XL, XXL and 3XL—are available. Compare the garment measurements with clothing you already own, including the trousers. In M, the coat measures 104 cm long, the inner top 82 cm long, and the trousers 103 cm long with an 82 cm waist. Those numbers help you assess the layers together.
Across the chart, coat lengths run from 100 cm in XS to 112 cm in 3XL, while inner-top lengths range from 79 cm to 88 cm. XS trousers list a 68 cm waist and 97 cm length; 3XL trousers list a 118 cm waist and 115 cm length.
Pay particular attention to the bust column: S lists 92 cm, while M lists 110 cm for both coat and inner top. That sharp increase is printed in the chart. Check the actual figures rather than assuming an even progression between letters. Measurements were taken flat by hand, with a possible difference of 1–3 cm.
A Demon Lord among familiar company
Rimuru’s approachable manner gives this severe palette an interesting counterpoint. You can let the coat suggest authority while keeping the expression relaxed. For photographs, leave enough space beneath the waist to show how the black outer layer frames the grey trousers; a tight face crop loses much of this version’s identity.
Milim Nava beside this black-coated Rimuru would make a characterful Demon Lord pairing, with her exuberance playing against his more measured presence.
More from Tempest, plus a fantasy companion
Start with these two same-franchise costumes; the additional item is a fantasy theme pick.
- For another Rimuru silhouette, consider the That Time I Got Reincarnated As A Slime Rimuru Tempest Cosplay Costume Navy Blue Zip Vest, White Pants And Arm Cuffs Set.
- Rimuru’s fellow Demon Lord offers a lively partner in That Time I Got Reincarnated as a Slime Milim Nava Cosplay Costume.
- As a fantasy theme pick, Mushoku Tensei Roxy Migurdia Cosplay Costume Brown Cape Dress With Witch Hat shifts the emphasis toward a travelling magician.