I'm 5'11" feet tall, USA, my personal style is very practical and not very feminine, and I shop almost exclusively online. It's more expensive, but it works for me for many reasons. I'm too busy to go shopping. But when I have, there's at least one supportive employee eager to help me.
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I measure myself and compare those measurements to the Size Guide. Sometimes the measurements are still off, but I havent had trouble.
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Sometimes I buy specifically from brands advertising Tall and Plus Size. In some garments, a Tall XL has been the perfect fit for me. For example, Overalls.
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My basic outfit consists of High Waisted Jeans and a Scoop Neck T-shirt that is tucked into them. Lightly colored jeans, dark T-shirt.
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I am never wearing clothing that is uncomfortable for me. I depend on a woven nylon belt to keep my jeans up, they are a bit loose.
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I've watched a few videos about how to dress for trans fems. Nano Nano made one thats just 6 minutes, it was enough for me to get started.
As always, your mileage may vary.