Ce gilet est assorti à mes baskets.

Ce is the masculine singular demonstrative adjective used before most consonant sounds.

• ce = masculine singular before a consonant
• cet = masculine singular before a vowel or mute h
• cette = feminine singular

Since gilet is masculine singular and starts with the consonant sound g, you use ce:

• ce gilet
• but cet hiver
• and cette veste

Gilet is masculine, which is why the sentence uses:

• ce gilet
• assorti ending in -i

If it were feminine, you would see forms like cette and assortie.

Because assorti agrees with gilet, which is masculine singular.

French adjectives usually change form to match the noun they describe:

• masculine singular: assorti
• feminine singular: assortie
• masculine plural: assortis
• feminine plural: assorties

So:

• Ce gilet est assorti...
• Cette veste est assortie...
• Ces pantalons sont assortis...

Assorti à means matched with, coordinated with, or goes with.

The adjective assorti is commonly followed by à when you say what something matches:

• assorti à mes baskets = matched with my sneakers
• assorti à la jupe = matched with the skirt

So the structure is:

• [thing] + est assorti(e) à + [other thing]

That is just the French pattern for this adjective. In English you say matched with, but in French the natural construction is assorti à.

This is a good example of something you should learn as a chunk:

• être assorti à quelque chose

Trying to translate prepositions directly from English often causes mistakes, so it is better to remember assorti à as a fixed combination.

Mes means my and is used with a plural noun.

Here, baskets is plural, so French uses mes:

• mon = my + masculine singular
• ma = my + feminine singular
• mes = my + plural

Examples:

• mon gilet
• ma veste
• mes baskets

No. In French, des baskets usually means sneakers, trainers, or casual athletic shoes.

So mes baskets means my sneakers / my trainers, not literal baskets you carry things in.

The singular is une basket, but it is very often used in the plural because people usually talk about a pair of shoes:

• mes baskets sont neuves
• j’aime ces baskets

In this sentence, it works as a description, not as a true passive that focuses on who did the action.

Être assorti often means something like:

• to match
• to be coordinated
• to go well with

So Ce gilet est assorti à mes baskets is best understood as a descriptive statement: the cardigan/vest matches the sneakers.

Yes. That is a very natural alternative.

Compare:

• Ce gilet est assorti à mes baskets.
  More about being color-coordinated or stylistically matched.

• Ce gilet va bien avec mes baskets.
  More general: this cardigan/vest goes well with my sneakers.

Both are correct, but assorti à sounds a bit more specifically about matching.

Because assorti is being used with être as part of the predicate:

• Ce gilet est assorti à mes baskets.

It is not directly placed before the noun. The pattern is:

• subject + être + adjective

This is like:

• Le ciel est bleu.
• La porte est ouverte.

You could also use assorti directly before a noun in some contexts, but here the sentence is built around est assorti.

A careful approximate pronunciation is:

suh zhee-lay eh ah-sor-tee ah may bas-ket

A few useful notes:

• Ce sounds like suh
• gilet sounds like zhee-lay
• est is often pronounced like eh
• assorti has a French r
• mes sounds like may
• baskets is roughly bas-ket

In natural speech, ce gilet est flows together smoothly.

Yes, several.

• In ce, the final e is not pronounced strongly.
• In est, the final t is silent.
• In mes, the final s is silent.
• In baskets, the final s is silent.

Also, the g in gilet sounds like the s in measure, not like the hard g in go.

The adjective and sometimes the demonstrative adjective would change to match the noun.

Examples:

• Cette veste est assortie à mes baskets.
  Feminine singular

• Ces gilets sont assortis à mes baskets.
  Masculine plural

• Ces vestes sont assorties à mes baskets.
  Feminine plural

So you need to watch both:

1. the form of this/these: ce / cette / ces
2. the ending of assorti: assorti / assortie / assortis / assorties