What is 'good moral taste'?

[Bede735]

FINA rules state:

General Rule 5 SWIMWEAR

GR5.1 The swimwear (swimsuit, cap and goggles) of all competitors shall be in good moral taste and suitable for the individual sports discipline and not carry any symbol which may be considered offensive.
GR5.2 All swimsuits shall be non transparent.
GR5.3 The referee of a competition has the authority to exclude any competitor whose swimsuit or body symbols do not comply with this Rule.
GR5.4 Before any swimwear of new design, construction or material is used in competition, the manufacturer of such swimwear must submit the swimwear to FINA and obtain approval of FINA.

By Law 8 SWIMWEAR

BL 8.1 All FINA approved swimwear to be used at the Olympic Games and FINA World Championships must be approved by FINA at least twelve (12) months prior to the start of the respective competition. In addition, it must be available for all competitors by 1st January of the year of the Olympic Games or FINA World Championships.
BL 8.2 In swimming competitions the competitor must wear only one swimsuit in one or two pieces. No additional items, like arm bands or leg bands shall be regarded as parts of a swimsuit.
BL 8.3 From January 1st 2010 swimwear for men shall not extend above the navel nor below the knee, and for women, shall not cover the neck, extend past the shoulder, nor shall extend below knee. All swimsuits shall be made from textile materials.

http://www.barnessc.org/gala-costume-regulations.html

I can understand transparent suits not conforming to the rules (fairly obvious), but how is morality defined?