Some plural English nouns are singular in French and vice versa

In French, collective nouns can be singular or plural.

Learn about French collective nouns

Singular where plural in English (Collective nouns)

In English, what we call collective nouns (e.g. family, team, police, company, ...) can be followed by a verb either in singular or plural form, depending on whether we consider the group as a single unit (singular), or as the individuals forming the group (plural).

However, these collective nouns are always followed by singular in French. 

Plural where singular in English

Note that words such as ''holiday'' (vacances) and ''hair'' (cheveux) are always plural in French. The adjectives or verbs following them are also in plural form.

Case of toilette(s)

Note that toilettes is always used in the plural to mean "the toilet/restroom".
La toilette (singular) in French means "a (personal) wash".