Kobe Bryant Los Angeles Lakers #8 Hardwood Classics Edition basketball jersey.

This should help you understand why a jersey such as Mitchell & Ness Kobe Bryant #8 Los Angeles Lakers Hardwood Classics Blue Throwback Jersey feels and looks the way it does

Core features of basketball jerseys

Material & Breathability: Most basketballjerseys are made from synthetic fabrics such aspolyester or polyester-mesh. 

Polyester (and often mesh) is lightweight, durable, moisture-wicking so it pulls sweat away and dries quickly.

Mesh construction (open weave, breathable) helps ventilation and keeps a player (or wearer) cooler during intense activity.

Fit & Freedom of Movement: Basketball jerseys are designed for mobility. healongsport.com +1

They typically have a sleeveless cut and wide armholes so arms have full range of movement (for shooting, passing, etc.).

Many jerseys feature athletic /performance-cut design (rather than a standard t-shirt fit): that means tailored around the shoulders, chest and torso to avoid bunching and allow natural motion.

Durability & Comfort: Good jerseys balance comfort with durability. 

Seams and stitching (or quality printing methods) are used so that names, numbers and logos don't peel off or fade quickly.

Breathable fabrics plus moisture-wickling help avoid overheating and discomfort, especially during energetic play or long wear

Design & Team Identity: Jerseys aren't just they represent teams/players. functional

They usually have the team name/logo on the front, and player name + number on theback (or in some designs). 

Colors, fonts, logos - everything is designed to be bold and visible (on court or in fan-wear) so the jersey stands out