Firstly you will need to know the measurements or bra size of the recipient, then consult our size chart. If between sizes, go for the larger. It may be that the top and bottom are different by one size, this is not unusual. If unsure of the sizes avoid close fitting garments (basques, bras, thongs corsets etc) consider camisoles, french knickers, suspenders or briefs. If no idea of size, perhaps a kimono, or even gift vouchers might be the best option.