In a letter to the prime minister, Suman Singh, wife of ex-armyman Dharamvir Singh, reminded Modi that the Bharatiya Janata Party had before the 2014 Lok Sabha polls claimed if it came to power, Pakistan would not "dare" attack Indian soldiers.
"But the situation is even worse now," she wrote.
Her husband told reporters here that the letter addressed to the Prime Minister, along with the blouse, had been submitted to the Zila Sainik Board in Fatehabad.
Being an ex-army man's wife, he said, Suman had expressed anguish at the recent spate of killings.
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"She told me that women send their sons, brothers, husbands to the border to defend their motherland and not to get beheaded and get pelted with stones. Where has the 56-inch chest gone now, she asked," the Fatehabad resident said.
The ex-serviceman was asked if the gesture could be seen as an insult to the office of the prime minister.
Suman wrote in her letter that videos had surfaced "in which our soldiers are seen being slapped, humiliated and pelted with stones". Two soldiers were beheaded by Pakistan, she wrote.
She referred to Lance Naik Hemraj, who was beheaded by Pakistan's Border Action Team in January, 2013.
"At the time of the 2014 Lok Sabha polls, we felt that no more of our soldiers will be beheaded like Hemraj and enemy will think ten times before doing such action, but they have been repeated," the letter said.
"The way the hands of our soldiers are tied they are unable to take the situation head on, which is most unfortunate," she wrote.
Dharamvir said he was deployed in Jammu and Kashmir for over 11 years.
"I was part of several counter insurgency operations. I also got the Sena Medal from the President on two occasions. My son is also preparing to join the forces," he said.