when I am in the shop after trying clothes how to say "I am buying it"?

and  how to say "it didnt fit"?  "I didnt li,ke it"?

 "I am buying it"  = Alýyorum or alacaðým

"it didnt fit" = Olmadý ya da büyük/küçük geldi

Thank you! And "I didnt like it"  should be beðenmedim, right?

 it is true.

I didn´tlike it > Canim istemiyor

It doesn´t suit me > Yakiþmiyor

Caným istemiyor = I don´t feel like it (doesn´t convey the same meaning as ´beðenmedim´ = I didnt like it)

Yakýþmýyor = It doesnt suit me (but not in size, it means that what you wear doesnt look good on you. For example the model or the colours)

Hoþuma gitmedi = I didn´t like it (at all)

 ´Caným istemiyor´ isnt it ´ i dont like it and thats all´...you know..like a spoiled child answer? ( like: ´i dont want because i dont want..no comment) ?

 To complete the answers other people gave:

I am buying (it)= Alýyorum

I am buying this (when holding it in your hand or pointing at it)= Bunu alýyorum

I am buying that one (pointing at something further away) = Onu alýyorum

For example: I will take this one, but I wont buy that one --> Bunu alýyorum, ama onu almayacaðým.

Olmadý, büyük geldi = It didnt fit, it is too big

Olmadý, küçük geldi = It didnt fit, it is too small

(bana) Yakýþmýyor = It doesnt look fine (on me)

Beðenmedim = I didnt like it

super, thank you all!