Me gusta vestirme despacio los domingos, porque así empiezo el día con más calma.

Because gustar works differently from English to like.

In Spanish, the thing you like is the grammatical subject, and the person who feels the liking is an indirect object:

• Me gusta vestirme despacio. = Dressing slowly pleases me / I like dressing slowly
• Me = to me
• gusta = is pleasing

So yo gusto would not mean I like. It would usually mean something like I am pleasing / I am liked, which is not what you want here.

Vestirse is the reflexive verb meaning to get dressed or to dress oneself.

• vestir = to dress someone / to dress
• vestirse = to get dressed

So:

• vestirme = to get myself dressed / to get dressed

The -me is the reflexive pronoun myself attached to the infinitive.

In this sentence, the speaker is talking about their own routine, so the reflexive form is the natural choice.

Usually, no—not if you mean I like getting dressed slowly.

Vestir without the reflexive often means to dress someone or to wear/dress in a certain style, depending on context.
If you are talking about dressing yourself, vestirse is the normal verb.

So:

• Me gusta vestirme despacio = I like getting dressed slowly
• Me gusta vestir despacio sounds incomplete or unnatural for that meaning

Yes. With a structure like gustar + infinitive, the reflexive pronoun can be attached to the infinitive:

• Me gusta vestirme despacio

That is the normal and neat option here.

You could also see pronouns attached to infinitives in many other structures:

• Quiero vestirme
• Voy a vestirme

What you cannot say is:

• Me gusta me vestir ❌

That word order is wrong in Spanish.

Here despacio is an adverb, meaning slowly.

It modifies the action vestirme:

• vestirme despacio = to get dressed slowly

It is not changing a noun, so it is not acting as an adjective here.

Spanish often uses adverbs like this directly after the verb or infinitive.

Yes, grammatically you could say Me gusta vestirme lentamente, but despacio sounds much more natural and everyday in this context.

Very roughly:

• despacio = slowly, at an unhurried pace
• lentamente = slowly, but often a bit more formal or literary

For daily routines like getting dressed, despacio is the more idiomatic choice.

Because los domingos means on Sundays / every Sunday / Sundays in general.

In Spanish, the definite article is commonly used with days of the week to talk about habitual actions:

• Los domingos descanso. = I rest on Sundays.
• Los lunes trabajo desde casa. = I work from home on Mondays.

By contrast:

• el domingo usually means on Sunday (one specific upcoming or mentioned Sunday)

So here los domingos shows a regular Sunday habit.

Because Spanish often leaves out subject pronouns when the verb already makes the subject clear.

• empiezo already means I start
• So yo empiezo is usually unnecessary

Spanish is a pro-drop language, which means subject pronouns are often omitted unless needed for emphasis, contrast, or clarity.

So:

• porque así empiezo el día... = normal
• porque así yo empiezo el día... = possible, but more emphatic than needed

Here así means something like that way, like that, or by doing that.

So:

• porque así empiezo el día con más calma

means:

• because that way I start the day more calmly
• because by doing that, I start the day with more calm

It refers back to the previous idea: getting dressed slowly on Sundays.

Con más calma literally means with more calm, but in natural English it usually means:

• more calmly
• in a calmer way
• with less rush

This is a very common Spanish expression. Spanish often uses con + noun where English might prefer an adverb.

Compare:

• Habla con calma. = Speak calmly.
• Lo hice con cuidado. = I did it carefully.
• Empiezo el día con más calma. = I start the day more calmly / in a calmer way.

Because calma is a noun, and the sentence uses the fixed pattern con + noun:

• con calma = calmly / in a calm way
• con más calma = more calmly / with more calm

You could express a similar idea in other ways, for example:

• más tranquilamente
• de forma más tranquila

But con más calma is very natural, simple, and idiomatic.

Empiezo is the present tense of empezar.

It is also a stem-changing verb:

• empezar
• empiezo
• empiezas
• empieza
• empezamos
• empezáis
• empiezan

The e changes to ie in most forms, except nosotros and vosotros.

In this sentence, the present tense is used to describe a habitual action or general truth: this is how the speaker typically starts the day on Sundays.

This is a good advanced question.

In many Spanish sentences, porque is not preceded by a comma:

• Me gusta vestirme despacio los domingos porque así empiezo el día con más calma.

That version is also perfectly natural.

The comma here can make the second part feel a bit more like an added explanation:
I like doing this, because this is how I start the day more calmly.

So the comma is not essential for understanding, and many writers would leave it out. It is more a matter of style and how the sentence is being framed.

Yes, it is completely natural.

The order is:

• Me gusta = I like
• vestirme despacio = getting dressed slowly
• los domingos = on Sundays

Spanish is flexible with word order, but this version is smooth and standard. It places the main idea first, then the time expression.

You might also hear slight variations depending on emphasis, such as:

• Los domingos me gusta vestirme despacio.

That puts more focus on on Sundays. Both are correct.