If you are looking for dance wear etc try the following outlets in the area.

Glamour Gear
7 Norwich Road, Ipswich, 01473 289863
(at the rear of, and linked to, the Lait Dance Club.

Dance Vibe
20a Fore Street, Ipswich, IP4 1JU
01473 253123

Dancia International
27 St Benedict's Street, Norwich, 01603 619713

Porselli
4 Frensham Road, Sweet Briar Ind.Est., Norwich NR3 2BT
01603 406700

Farther afield, if you ever get to Blackpool, you can find Javid Fashions in Coronation Street just near the tower.

The Stephen Martin Dancewear shop in Blackpool is now closed so that Steve and Jacqui can concentrate on attending dance holidays, competitions and festivals. They still operate a full mail order service for a wide range of social and party dancewear, full circle skirts, sequin tops etc, at reasonable prices, now from a new address;
Stephen Martin, PO Box 125, Thornton Cleveleys, FY5 4WD.
You can also telephone them on 01253 857369, 9:30 to 13:30, Monday, Wednesday or Friday for a live answer, or talk to their machine at other times.