The lilies, which will be dyed orange for the occasion, will be needed because the orange lily, normally worn on 12 July marches, will not be in bloom until the summer.

"We're thinking of getting Easter lilies and spraying them orange for the day, " said Willie Frazer, one of the organisers of the march.

Frazer, from Families Acting for Innocent Relatives (FAIR), also said that the organisers would like a "decent, law-abiding TD" to play a central role in the demonstration outside Leinster House on 25 February, as a gesture to people in the Republic .

"We want to show we're not anti-Catholic, we're anti-terrorist, " he told the Sunday Tribune. "We would love a TD to come forward and offer to chair the event. We don't know who to ask but anyone sympathetic should contact us.

"We wouldn't want any Sinn Fein politician though. There would be no point in Gerry Adams offering. We only want someone well-respected."

Speakers will include DUP MP Jeffrey Donaldson, and Ulster Unionist Danny Kennedy.

Frazer said Donaldson had invited Michael McDowell to attend. "I wanted to ask McDowell to speak at the rally, but some people felt that might be used against him by his political opponents, so we're now just asking him to come along on the day and talk to some victims.

"If he himself feels he could address the rally, that would be wonderful, but we will leave it up to him to offer because we don't want to embarrass him."

Frazer said the route still had to be decided.

Two options under consideration involve the parade leaving from O'Connell Street or Dawson Street.

Frazer dismissed claims that neo-Nazi groups like Combat 18 would take part.

"There'll be no clowns like that on the march. It will be decent, well-behaved folk only."

Union jacks and Ulster flags would be displayed, but the tricolour could also be carried, he said. "We mightn't like the tricolour when we're in Northern Ireland, but it's the flag of the Irish state and when we're in the Irish state, we'll respect it."

Jeffrey Donaldson said he was awaiting Michael McDowell's response to his invitation.

"We are marching in Dublin to highlight the plight of IRA victims, not to offend anyone.

We hope the event will pass peacefully without trouble from republicans or anyone else, " he added.