Do I need a full bodysuit, or will shorts or a brief be enough?
It depends on what the dress already covers. If the dress has built-in bust support and just needs a smoother line at the stomach or hips, a high-waisted short or brief is enough. If the dress is backless, strapless, or has a plunging neckline, you likely need a bodysuit built for that specific opening, since shorts and briefs don't address the bust or back at all.
What's the difference between a plunge bodysuit and an open-bust bodysuit?
A plunge bodysuit has its own low front and back built in and is meant to be worn largely on its own. An open-bust bodysuit is designed to be worn with your own bra, since the bust area is left open — useful for dresses with underwire support where you don't want to double up on compression at the chest.
Will any of these show through a thin or clingy dress fabric?
The listings for the mid-thigh shorts and the plunge bodysuit both use the word 'seamless' or 'invisible,' which suggests they're designed to minimize visible lines. That said, the listing alone can't confirm performance under every fabric weight, so thinner or clingier dresses deserve a closer read of the specific product images and material description before assuming invisibility.
How do I know which compression level I actually want?
Lightweight or 'all-day comfort' language, as used for the high-waisted brief, points to something meant to be worn for extended periods without much pressure. A stated compression tier like Level 4, as with the open-bust bodysuit, signals firmer, more noticeable control. If the listing doesn't name a tier, as with the commando bodysuit, treat compression as an open question rather than assuming it matches the others.
Can I wear a butt-lifting short under a fitted dress without it showing?
The Leonisa shorts are described as having an invisible butt lifter, which suggests a design intended to avoid visible seams, but as with any shapewear, fit against a specific fitted dress fabric isn't something the listing title can guarantee. Sizing accuracy matters more than the brand claim here.
Are any of these suitable for a strapless dress?
None of the listings explicitly market a strapless-specific design. The low-back plunge bodysuit addresses backless dresses, but strapless support at the bust is a different requirement that isn't clearly named in any of these six listings, so that's worth confirming directly with the seller or product images before buying for a strapless dress.