Rehearse the seat
Sit in the complete outfit on an ordinary chair for a few minutes. Bend your legs and put a bag on your lap. A thick belt fastening or several tucked layers can become more noticeable than when standing. Rearrange the top before rejecting trousers that are otherwise comfortable.
With a skirt or dress, check whether you are happy with the seated length. An additional layer underneath is useful only if it remains comfortable. There is no required travel uniform; what matters is how the selected pieces behave over time.
Keep one layer accessible
Do not put a light jacket or cardigan at the very bottom of the suitcase. You should be able to reach it at your seat without unpacking everything. Check whether it fits into your smaller bag when removed again. A layer with nowhere to go can quickly end up on the floor or in the way.
A long scarf may feel comfortable in a narrow seat but catch when you stand up. Gather loose ends before entering the aisle. Large sleeves and broad jacket pockets also need space when you pass other seats.
Include arrival in the choice
If you have an appointment immediately after travelling, choose a top that looks appropriate without extensive changing. A lightweight spare blouse can help if there is somewhere to change at the destination. Without that opportunity, a suitable base from the start is more reliable.
Shoes should be tested both for sitting and for walking with luggage. Check the trouser length with that exact pair. Put your ticket, phone and keys in an accessible pocket so every check does not require reorganising yourself between clothes and bags.
