Translation:I wear old pants and a sweater in the garden.
The Cambrige dictionary says sweater is also used in the UK English, together with a jumper.
UK also jumper a piece of clothing, typically with long sleeves and made from wool, that is worn on the upper part of the body
That is exactly the Czech svetr.
Could it not be: "In the garden I wear old pants/trousers and a sweater/jumper."? P.S I speak UK English but I put sweater and pants because that is what it says in the example.