The source includes:
• cracking the knuckles;
• interlacing the fingers;
• placing the hands on the hips;
• turning the neck away;
• the disliked squatting posture (Iq'a);
• a man laying the forearms flat on the ground in Sujud;
• rolling or folding the sleeves up during prayer;
• praying only in trousers/lower garment when one is able to wear the fuller dignified clothing described by the source.
These are dislikes of posture and decorum. Turning the chest away from Qiblah is not merely Makruh; it was already taught as an invalidator.