You can wear a variety of undergarments under a tank top, depending on your personal preference and the style of the top. Options include a strapless bra for a seamless look, a bralette for a more casual and comfortable feel, a camisole for added coverage and layering, or a sports bra for a sporty and supportive option. Ultimately, choose what makes you feel comfortable and confident. **

Vaseline glows under blacklight because it contains a substance called petroleum jelly, which is a hydrocarbon. When exposed to ultraviolet (UV) light, the hydrocarbons in Vaseline absorb the UV light and then re-emit it as visible light, creating the glowing effect. This phenomenon is known as fluorescence, where certain substances absorb light at one wavelength and then emit it at a longer wavelength, making them appear to glow under UV light. **

Clothing items that are made with fluorescent or phosphorescent materials will glow under blacklight. This includes items such as neon-colored clothing, certain types of white clothing, and items with glow-in-the-dark designs or prints. Additionally, some laundry detergents and fabric softeners contain optical brighteners that can cause clothing to glow under blacklight. **

It is not necessarily pointless to wear only a tank top under a leather jacket, as it can be a stylish and edgy look. However, it may not be practical in colder weather as the tank top may not provide enough warmth. Additionally, the leather jacket may not sit as comfortably on bare skin compared to wearing a long-sleeved shirt underneath. Ultimately, the decision to wear only a tank top under a leather jacket depends on personal style preferences and the weather conditions. **

It ultimately depends on personal preference and the specific situation. If the T-shirt is thin or sheer, an undershirt can provide an extra layer of coverage and warmth. However, if the T-shirt is made of a thicker material and the weather is warm, a tank top may be a more comfortable option. It's important to consider the fit and style of the T-shirt as well as the individual's comfort and modesty preferences when deciding whether to wear a tank top or an undershirt underneath. **

Scorpions glow under UV light due to a substance in their exoskeleton called hyaline, which contains fluorescent chemicals that react to the UV light. This causes the scorpions to emit a blue-green glow, which is thought to help them detect and avoid UV light, as well as potentially attracting prey. The exact purpose of this fluorescence is still not fully understood, but it is believed to play a role in their survival and behavior in their natural habitat. **

Bats glow under infrared light due to a phenomenon called fluorescence. This occurs when certain molecules in their fur and wings absorb ultraviolet light and then re-emit it as visible light. This adaptation may help bats to communicate with each other, navigate in the dark, or potentially even deter predators. It is also possible that the fluorescence helps bats to regulate their body temperature or protect them from harmful UV radiation. **

Your friend may appear to glow under blacklight because certain substances in their clothing, makeup, or skin contain phosphors that emit visible light when exposed to ultraviolet (UV) light. These phosphors absorb the UV light and then re-emit it as visible light, creating the glowing effect. This phenomenon is commonly seen in materials such as white clothing, fluorescent colors, and certain types of body paint. **