das Trikot
jersey
A sporty top, usually a shirt, worn by athletes to show that they belong to a team.
Die Fans trugen das Trikot ihrer Lieblingsmannschaft im Stadion.
The fans wore the jersey of their favorite team in the stadium.

jersey
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jersey
A sporty top, usually a shirt, worn by athletes to show that they belong to a team.
Die Fans trugen das Trikot ihrer Lieblingsmannschaft im Stadion.
The fans wore the jersey of their favorite team in the stadium.

The context determines the meaning. If people are talking about sports, fans, or teams, it means the sports shirt. If they are talking about fabrics, sewing, or the material composition of clothing, it means the elastic fabric.
Der Spieler warf sein Trikot nach dem Spiel in die Menge.
The player threw his jersey into the crowd after the game.
In a sports context, typical combinations are 'ein Trikot tragen' (to wear a jersey), 'ein Trikot kaufen' (to buy a jersey), or 'das Trikot einer Mannschaft' (a team's jersey). The player's number on the back is also often mentioned.
Mein Sohn wünscht sich zum Geburtstag das neue Trikot seines Lieblingsvereins.
My son wants the new jersey of his favorite club for his birthday.
When 'Trikot' means the fabric, it is often used with the preposition 'aus' to describe the material of a piece of clothing. It then appears without an article.
Diese Hose ist aus Trikot und daher besonders bequem.
These pants are made of jersey fabric and are therefore especially comfortable.
shirt
'das Shirt' and 'das Trikot' can both be a top, but they belong to different situations. A 'Shirt' is a general, light item of clothing for everyday wear. A 'Trikot' is a sporty top, often with a number, club colors, or a team's logo. Learners may confuse the words because a jersey can look like a shirt from the outside. If you are simply talking about everyday clothing, you say 'Shirt'. If it is about sports, a team, or a club, 'Trikot' is more precise.

Vor dem Spiel bekommt jeder Spieler ein neues Trikot mit seiner Nummer.
Before the game, each player receives a new jersey with their number.
Heute trägt Selma ein schwarzes Shirt zur Arbeit.
Today Selma is wearing a black shirt to work.