My own flesh and blood

Loki has always dressed well, often times ostentatiously. Whether he is at war, passing as a Midgardian, or held captive as an Asgardian prisoner, Loki communicates his social class and sense of superiority through clothing. For him, clothing armors his fragile sense of self and against others' opinions of him. He intends to be perceived as deadly charming but ultimately unapproachable.

His attire in the first Thor movie is roughly equal parts green and gold, signifying his royal status. His style is dressed down for his brother's misadventures in Jotenheim, yet overall both silhouettes are lofty, princely, but not hardened or threatening.

In Avengers, Loki's look has more black and leather, with exaggerated emphasis on his shoulders meant to intimidate as he assumes the role of villain. The silhouette is very hard, heavy, and edgy. Gold detailing is prevalent as well. Combined with the goat's helm, this is Loki's most pretentious outfit, which speaks to an undercurrent of low self-esteem and a compulsive need to impress. There's no mistaking he is the main antagonist of the story.

In Thor 2, Loki's attire is similar to Avengers but the overcoat is exchanged for a less bulky version (perhaps conveying he is less guarded now that the effects of the Mind Stone are no longer influencing him). Loki's role likewise pivots from the harsh lines of a villain to the more flexible edges of a reluctant villain-turned-ally. This aligns with his character arc when he protects both Jane and Thor, seemingly sacrificing himself.

In Thor 3, Loki's silhouette is streamlined even further. The overcoat is done away with in favor of what appears to be a leather doublet, pauldrons, and vambraces. Gold accents are minimal. While stylish, Loki's attire is more practical than showy, and his helm serves the dual purpose of protection as well as weaponry. At this point in his arc, Loki has become a full antihero, joining his brother's side in rescuing as many Asgardians as possible, and eventually dying in a vain bid to protect Thor from Thanos.

The TVA does something very fun and interesting in taking away Loki's ability to dress himself. Since Loki cannot use his magic in the TVA, he is forced to wear the same clothing as his captor/advocate, who eventually becomes his best friend and peer.

Perhaps, on a subconscious level, this helped Loki to feel included. We know by his pwn admission that Loki fears being alone and desperately craves a sense of belonging. At the same time, he intentionally dresses to put people at a distance, thereby protecting himself from potential rejection at the cost of isolating himself further.

When Mobius gives him that TVA jacket for the first time, Loki seems uncharacteristically pleased. It is not an attractive jacket by any means, yet he neither scoffs at it nor refuses to wear it. Instead, Loki puts it on and is content when Mobius says it looks "smart" on him. He continues to dress like Mobius and, indeed, mimic some of his mannerisms such as placing his hands on his hips. Without clothing meant to push people away, Loki opens up, has more fun, and makes friends.

Loki's choice of attire as he assumes the mantle of God of Stories (and time) is fascinating. Setting aside the clear design inspiration from the comics, Loki's silhouette is soft, remarkably so. His colors are earthy hues of green, and the only bit of flare are the light gold trimming and crown. The look brings to mind the garb of sages and wise wizards rather than royalty or warriors. He's powerful yet approachable because there is humility in his bearing. And that humility springs from a well of healthy self-worth, self-love, and a deep love for others.