SINGAPORE - A former sales assistant at a clothing shop was jailed for four weeks on Wednesday for filming women in the changing room.

Tan Wee Sien, now a full-time national serviceman, had stood on a ladder in the storeroom of the shop in Cathay Orchard Cineleisure to commit four of five offences of insulting modesty.

The 22-year-old, who admitted to two of the five charges, was working in the shop between May and July 2013.

He was caught on July 14 that year, when a customer noticed a mobile phone at the top of the fitting room while she was changing.

She shouted and dressed, and confronted Tan who admitted to filming her changing. Her boyfriend called the police.

No videos of the victim were found in his cell phone as he had deleted them.

The court heard that he managed to video two unidentified women wearing only their undergarments in the fitting room on separate occasions.

Deputy Public Prosecutor Jason Chua told District Judge Shaiffudin Saruwan there were many aggravating factors in this case.

He said there was a substantial degree of pre-meditation. This was not a typical "upskirt" type of offence.

"The accused had to take a series of deliberate steps to achieve his aim of recording the videos," said Mr Chua.

Unlike the "upskirt" type of case, the videos were extremely intrusive, and would cause immense distress and embarrassment to the victims if disseminated.

Mr Chua said there was also an element of abuse of trust. Tan took advantage of his position as a staff member of the clothing shop.

He said the prosecution is aware that Tan was 20 then and has been diagnosed with attention deficit hyperactivity disorder (ADHD) but said his condition should not excuse him.

Tan could have been jailed for up to one year and/or fined for each charge of insulting modesty.