Using dynamic image dimensions with glide

Within my image fieldset I created a new field for the width. I want to use that field within my image set. Is that the correct approach, or should this be done another way?

Anyway, I want to access the width value within the glide holder, I just don't know how to use it. See USE width HERE below.

<div class="image {{ classes }}">
    {{ if width }}
        {{ glide:image width="USE width HERE" }}
            <img src="{{ url }}" width="{{ width }}" height="{{ height }}" alt="{{ alt }}">
        {{ /glide:image }}
    {{ else }}
        <img src="{{ url }}" width="{{ width }}" height="{{ height }}" alt="{{ alt }}">
    {{ /if }}
</div>