は紳士服を

men's clothing

→ は
phrase Rare #37,456
men's clothing This sequence is not a standalone phrase: は marks the topic and を marks 紳士服 as the object of a following verb, such as 売る (to sell) or 生産する (to produce). 紳士服 literally means men's clothing.
JA: この店は紳士服を販売しています。
EN: This store sells men's clothing.

その老人たちは紳士服を生産します

Those elderly men produce men's clothing.

あの店は紳士服を売っています

That store sells men's clothing.

工場は紳士服をもっぱら生産している

The factory primarily produces men's clothing.

その老人たちは紳士服を製造します

Those old men manufacture men's clothing.