Trouble understanding 着ていったら


I am having trouble understanding 着ていったら in the following sentence:

明日の夕食会にはどんな服を着ていったら良いですか。

I understand how ~たら is normally used, its more combination with ていっ that
seems to be throwing me off.

How is this different from using 着たら ?




> 明日の夕食会にはどんな服を **着ていったら** 良いですか。

着ていったら is the たら form (conditional form) of 着て行く, "wear and go".  
(着て is the て form of the verb 着る. いったら is the たら form of [行]{い}く.)

The sentence is literally like...  
"To the dinner party tomorrow, what should I wear and go?"  
→ "What should I wear to go to the dinner party tomorrow?"




> 明日の夕食会にはどんな服を **着ていったら** 良いですか。

着ていったら is the たら form (conditional form) of 着て行く, "wear and go".  
(着て is the て form of the verb 着る. いったら is the たら form of [行]{い}く.)

The sentence is literally like...  
"To the dinner party tomorrow, what should I wear and go?"  
→ "What should I wear to go to the dinner party tomorrow?"

