A hat-trick of tries against Samoa last weekend took Breach’s tally for England up to 52, and she will pass another half-century milestone when she wins her 50th cap against Australia.
Having begun her career at nearby Pulborough RFC, the 27-year-old is assured a warm reception on the south coast.
“After the Six Nations, my dad did some calculations and said I could get my 50th at Brighton,” Breach told BBC Radio 5 Live.
“I said ‘hold tight, we have got some training and selction to go before that!’
“It would have been really special to get my 50th during a World Cup at home, but for it be in Brighton is even crazier.”
Breach’s top-end speed and finishing ability have always been evident. She scored six tries on her debut against Canada in 2017, and followed that with another five on her second Test appearance.
However, having returned to fitness following a serious hip injury, she made only two appearances in England’s Women’s Six Nations campaign earlier this year, with Abby Dow and Moloney-MacDonald emerging as Mitchell’s preferred wings.