Jacqui Putnam, who survived the Edgware Road blast in 2005, said people should “think twice” before making light of terrorism.
Manchester Unite defender Chris Smalling has apologised for his “insensitive” decision.
Smalling’s management said it was an elaborate pun on the popular “Jagerbomb” drink by strapping bottles of Jagermeister and Red Bull to his body.
He was pictured appearing to wear an army-style vest with a mock circuit board and cables. He also appears to be wearing an Arab kaffiyeh headdress.
Ms Putnam said people are still coming to terms with the bombing. “It does not make it any easier when you see people who make light of it,” she said.
“I am sure that he did not mean to offend anyone but I wish people would think twice.
Graham Foulkes, 61, from Oldham, whose son David died in the London 7/7 suicide bombings told The Sun the ‘jagerbomber’ costume was “one of the most offensive things I have seen”.
Wasserman Media Group said in a statement that the party was held in the assumed privacy of Smalling’s home. “Although he fully accepts in hindsight it was an ill-thought out and insensitive decision, absolutely no harm was intended whatsoever and he apologises for any offence caused.”