A term to describe a thick jacket as confining

What would one call a jacket or some other piece of uncomfortable yet protective heavy-duty clothing that restricts the wearer's movements due to its confining heaviness?

He wanted to release himself from the __ windbreaker.

Solution 1:

He wanted to release himself from the bulky windbreaker.

bulky:

1. of relatively large and cumbersome bulk or size.

2. (of a fabric or yarn) thick; lofty.

3. (of a garment) made of thick, resilient fabric or yarn.

(Dictionary.com)

Solution 2:

Cumbersome - "Difficult to handle or use especially because of size or weight" (WordWeb online)

Solution 3:

How about constrictive/constricting?

It emphasises that you can't move freely as a result of wearing the item and as such I think it's a great match for what you're trying to say.

Solution 4:

"He wanted to release himself from his straitjacket windbreaker".

• Literally, a straitjacket is a garment made of strong material and designed to bind the arms, as of a violently disoriented person.
• Figuratively, it's anything that severely confines, constricts, or hinders.