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Graceful outfit

TL;DR

Graceful clothing comprises weight-reducing gear that can be bought from Grace found in the Rogues' Den beneath the Toad and Chicken in Burthorpe. The pieces are bought with marks of grace, which are obtained by completing Rooftop Agility Courses.

Wearing the full Graceful outfit restores run energy 30% faster while the player is idle.

Graceful Set Cost

Item Weight reduction 
 
Cost (in Mark of grace
 
Sells for (in Mark of grace
 
Reduction per mark
(kg per Mark of grace
 
Graceful hood Hood -3 kg 35 28 0.086
Graceful top Top -5 kg 55 44 0.091
Graceful legs Legs -6 kg 60 48 0.100
Graceful gloves Gloves -3 kg 30 24 0.100
Graceful boots Boots -4 kg 40 32 0.100
Graceful cape Cape -4 kg 40 32 0.100
Complete set -25 kg

Sources

http://oldschoolrunescape.wikia.com/wiki/Graceful_outfit