The Websites below may be helpful resources for you.  

Dresses

Prom for Less

Whitley Bay - Posh Frocks and Bridal Boutique

Prom in the Community 

Oxfam Online Evening Dresses

Newcastle Dress Rental

Suit Hire 

Prom Suits

Men's Prom Suits & Outfits

Kilts, Tuxedos, Tailcoats and Morning Suit Hire | Slater Menswear