If you have a special occasion while you are pregnant and need an outfit you may want to actually visit the shops rather than buy online. Make it a lovely experience to enjoy and savour.
Brighton shops selling maternity wear:-
H&M – Western Road
Jo Jo Maman Bebe – Gardner Street
Debenhams – Churchill Square
Asda George – Brighton Marina or Carden Avenue
Matalan – Carden Avenue
Next – Shoreham Holmbush and limited stock in Churchill Square