# Commission Regulation (EC) No 3115/94 of 20 December 1994 amending Annexes I and II to Council Regulation (EEC) No 2658/87 on the tariff and statistical nomenclature and on the Common Customs Tariff, Division 3: For the purposes of heading Nos 6103 and 6104:

Extent: E+W+S+N.I.

(a) Title term ‘suit’ means a set of garments composed of two or three pieces made up in identical fabric and comprising:
one garment designed to cover the lower part of the body and consisting of trousers, breeches or shorts (other than swimwear), a skirt or a divided skirt, having neither braces nor bibs, and
one suit coat or jacket the outer shell of which, exclusive of sleeves, consists of four or more panels, designed to cover the upper part of the body, possibly with a tailored waistcoat in addition.
All of the components of a suit must be of the same fabric construction, style, colour and composition; they must also be of corresponding or compatible size. If several separate components to cover the lower part of the body are presented together (for example, trousers and shorts, or a skirt or divided skirt and trousers), the constituent lower part shall be the trousers, or, in the case of women's or girls' suits, the skirt or divided skirt, the other garments being considered separately.
The term ‘suit’ includes the following sets of garments, whether or not they fulfil all the above conditions:
morning dress, comprising a plain jacket (cutaway) with rounded tails hanging well down at the back and striped trousers,
evening dress (tailcoat), generally made of black fabric, the jacket of which is relatively short at the front, does not close and has narrow skirts cut in at the hips and hanging down behind,
dinner jacket suits, in which the jacket is similar in style to an ordinary jacket (though perhaps revealing more of the shirt front), but has shiny silk or imitation silk lapels;
(b) The term ‘ensemble’ means a set of garments (other than suits and articles of heading No 6107, 6108 or 6109), composed of several pieces made up in identical fabric, put up for retail sale, and comprising:
one garment designed to cover the upper part of the body, with the exception of pullovers which may form a second upper garment in the sole context of twin sets, and of waistcoats which may also form a second upper garment, and
one or two different garments, designed to cover the lower part of the body and consisting of trousers, bib and brace overalls, breeches, shorts (other than swimwear), a skirt or a divided skirt.
All of the components of an ensemble must be of the same fabric construction, style, colour and composition; they also must be of corresponding or compatible size. The term ‘ensemble’ does not apply to track suits or ski suits, of heading No 6112.

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Source: https://www.legislation.gov.uk/eur/1994/3115/annex/I/chapter/61/annotations/1/annotation/3 (the official version)
Page: https://openlegislation.uk/eu-regulation-1994-3115/annex-I/chapter-61/annotations/1/annotation/3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.