Strap or buckle up belt.

[tufguy]

We "buckle up" or "strap" our belts that we wear with pants.

I strap the belts myself that are attached to my brace to put it on.

Please check.

 

[GoesStation]

"Fasten" or "buckle" (without "up") is more natural, at least in AmE.

 

[Skrej]

You might hear somebody say 'strap in' (especially on a small plane or some kind of buggy), but you won't hear 'strap your belt'.

 

[Tarheel]

I think "belt" (or "belted") is used.

 

[tufguy]

I wore jeans and put a belt on it. I "fastened" or "buckled" the belt to tightened the jeans.

We can also say "I belted my belt" or "I strapped in my belt" or "I strapped my belt". Am I correct(

 

[emsr2d2]

Read post #3 again.

 

[Tarheel]

I wore jeans and put a belt on THEM. I "fastened" or "buckled" the belt to TIGHTEN the jeans.

Even though it is one item, we use the the plural. (Just like with "pants".)

It should be no surprise that I agree with GS. (In my post I was referring to what Skrej said.)

 

[tufguy]

We "fasten" or "buckle" our seat belts and I can use the same for my brace belts. But "I belted my pants" is it correct? I put belt on my pants to tighten it.

 

[Tarheel]

You fasten or buckle your belt. However, I am pretty sure "I belted my pants" isn't used.(You put your belt on, then you buckle it.)