i oseul ibeo bwayo.

-아/어 보다 is a common grammar pattern meaning to try doing something (to see what it’s like).
So 입어 봐요 literally means try wearing (it) → in natural English: Try it on.

• Base verb: 입다 (to wear)
• Connect to 보다: 입어 보다 → commonly said as 입어 봐요

입어요 simply means (I/you/they) wear / am wearing / will wear, depending on context.
Adding -어 보다 changes it to try:

• 이 옷을 입어요. = (I/you) wear this clothes / Put on this outfit (can sound like a plain statement depending on context)
• 이 옷을 입어 봐요. = Try wearing this / Try it on (a suggestion/request)

-아요/어요 (here: 봐요) is the polite informal style (often called 해요체).
It can function like a gentle request or suggestion, not necessarily a harsh command. In a store, it’s a normal way to say Try it on.

If you want to sound more politely “customer-service”:

• 입어 보세요. is more formally polite than 입어 봐요.

Both come from 보다 (to see / to try, in this pattern), but the ending changes the tone:

• 입어 봐요 = friendly, casual-polite suggestion
• 입어 보세요 = more respectful/polite suggestion (common in service situations)
• 입어 봐 = casual (to friends)
• 입어 보십시오 = very formal

-을/를 is the object particle, marking what the verb acts on.
Here, 옷 (clothes) is what you will try wearing, so it takes -을:

• 옷 + 을 → 옷을

Which one you use depends on the final sound:

• noun ends in a consonant → -을
• noun ends in a vowel → -를

입다 is a ㅂ-regular verb. When a verb stem ends in ㅂ, the ㅂ changes to 우 before a vowel-ending ending like -어:

• 입다 → stem 입-
• 입 + 어 would be awkward, so it becomes 이우 + 어 → 입어 (the spelling result is 입어)

So:

• 입다 → 입어 → 입어 봐요

Yes, you will commonly see both:

• 입어 봐요 (separated)
• 입어봐요 (combined)

Grammar-wise, 보다 is acting like an auxiliary verb (helping verb). In spacing rules, auxiliary verbs are often separated (입어 봐요), but in real-life writing the combined form (입어봐요) is extremely common and widely accepted.

That’s normal. 옷 ends with a final consonant sound, and when you add -을, the consonant links into the next syllable:

• Written: 옷을
• Pronounced: [오슬] (the ㅅ sound carries over)

So the whole sentence often sounds like:

• [이 오슬 이버 바요] (approximate)

이 옷 means this clothing item / this outfit (explicitly naming 옷).

• 이거 means this (thing) and is less specific; you can say 이거 입어 봐요 if it’s obvious you mean clothing.
• 이 옷이 would mark 옷 as the subject, which doesn’t fit this sentence’s structure. Here, the clothing is the object of 입다, so you use 옷을.

Yes. 한 번 often softens the suggestion and makes it sound like just give it a try:

• 이 옷을 한 번 입어 봐요. = Try this on once / Try it on (for a moment)

It’s very common in spoken Korean and sounds natural in friendly or service contexts.