Firstly, you need to determine what impression you want to make. What do you want your look to say about you; and then carefully select your clothing and accessories accordingly.
Here are a few scenarios...
If you are presenting a high level proposal to a conservative corporate company: You need to pack for a formal look. This may include a tailored jacket and trousers, or a skirt or a dress that can be worn with a jacket.
To add a personal touch to your look, wear a printed blouse, a blouse in a colour that really suits your complexion and/or a statement accessory like a Pichulik necklace. Formal doesn’t have to be boring.
If you are presenting a workshop: Consider the people and company you are presenting to. If you are going to be on your feet all day, ensure that you wear shoes that offer you comfort and style.
Most meeting and conference rooms are fairly plain in colour. To avoid blending in with the walls, wear a pop of colour, rather than neutral colours. A printed top with a classic pair of trousers will do the trick. This also helps to keep the attention on you rather than something or someone else in the room.
If you are attending a company function: Find out what the dress code is for the event. These days, even that can be confusing! My policy is always to go a little overdressed rather than underdressed. If your preferred outfit is a cocktail dress, maybe call the hotel or guesthouse before-hand to make sure they have an iron you can use.
If you are going to a conference: In many cases, a casual look is appropriate, but this doesn’t mean sloppy. To maintain your professional image, opt for a smart-casual look. For example, if you wear jeans, select a dark wash without too much fading and detail and pair it with a fitted blouse and casual pumps.
Clothing made of fabric that has a bit of stretch will allow you to be comfortable and presentable at the same time.
Before you start packing, watch this video on how to pack light and still achieve the look you are after.