yoke
That hole is called a sleeve. It allows you to put your arm through and comfortably wear the garment.
The frill on a shirt is commonly known as a ruffle. It is a decorative trim that adds texture and visual interest to the garment.
The ruffles on the front of a shirt are called a "ruffle front" or "ruffle bib". They are decorative frills or gathers of fabric that add texture and dimension to the garment.
Magnetized units forming clusters are called magnetic domains. In a magnetic material, these domains align to create a net magnetic moment. They can be manipulated by applying an external magnetic field.
The slit in a skirt is commonly referred to as a vent. Vents are designed to provide ease of movement and add a stylish touch to the garment.
A garment that hangs from the waist or shoulders and is typically worn by women beneath a dress or skirt is called a slip. Slips are designed to provide a smooth layer under clothing, preventing transparency and reducing friction with outer garments. They come in various lengths and styles, often made from lightweight materials like silk or nylon.
That is called a girdle.
The flap on the back of a shirt is commonly referred to as a "yoke." It is a piece of fabric that provides structure and support to the garment, often found at the shoulders. In some styles, like Western shirts, it can also serve a decorative purpose.
Shoulders!
The opening statement of the U.S. Constitution is called the preamble. It lays out who is forming the new government and why.
The tassels on the shoulders are called epaulettes. They are decorative ornaments often found on military and ceremonial uniforms.
A "onesie."
It is sometimes called a chasuble.
A smock
designers
Habit
that is called "blouse"